Sex Formula

Name: Sex Formula
Availability: InStock
Rating: 3.5 (20 reviews)
Author: MIGI STUDIO

by MIGI STUDIO

Uncensored window7 window10

Versionv1.9.0

EngineUnity

Released2026-03-23

Updated2026-04-09

LanguageEnglish, Japanese, Chinese

This game narrates how the player meets Reika and begins a life together. Before satisfying Reika sexually, she will not agree to date you, even if you already have a physical relationship.

Screenshots

DataNodes GoFile Pixeldrain VikingFile

v1.9.0 ● Fixed an issue where the achievement for the memory (recollection) feature could not be unlocked. ●New animation x 10 (Kitchen DoggyStyle) v1.8.0 [Animation] ●New animation x 6 (Kitchen OnTop) ●New main screen animation x 1 [Function] ●New facial appearances x 2 v1.7.0 ●New animation x 12 (Kitchen Missionary) ●New clothing x 1 v1.6.0 ●Added liquid effect display switch ●New animation x 8 (Bedroom Standing Position) v1.5.0 ●New animation x 10 (Bedroom DoggyStyle Position) ●New opening animation x 1 ●New Hairstyle x 1 v1.4 Hello everyone, Sex Formula v1.4.0 has been updated The revised contents are as follows [interface] ●Tab Key will no longer hide subtitles [Animation] ●New animation x 6 (Bedroom Ontop Position) [clothing] ●New clothing x 1 [Function] ●New Hair Material (B) ●Added color settings for hair material (B) ●When you leave the game, the current clothing settings will be recorded v1.3 [interface] ●Remove [Auto Position] function ●Add [Frame Rate] settings function [animation] ●New animation x 12 (Missionary in Bedroom) [clothing] ●New clothing x 1 [Function] ●Repair clothing judgment ●Fixed the DirtyTalk voice volume function ●Fix the voice volume function ●Fixed the problem of being unable to talk after pregnancy ●Fixed the problem that the recall function cannot trigger achievements v1.2 [interface] ●Newly added foreplay and sex button number markers ●Display correction in some languages [animation] ●New start screen x 2 ●Some animation corrections [clothing] ●Newly added high heels x 1 ●New clothing x 1 [Function] ●Newly added camera close to Reika’s lips for kissing ●Newly added camera is close to Reika’s breasts and can be sucked and touched Note 1: Reika must show her breasts Note 2: [If the left and right breasts are touched at the same time, the first touch is: sucking, the last touch is: touching] ●Newly added mobile camera can be changed to right click ●Added hotkey [F] to switch cameras ●Newly added hotkeys [1,2,3,4] to switch camera focus [VR function] ●VR has added the ability to kiss Reika by putting the helmet close to her lips ●VR newly added: Put the helmet close to Reika’s chest and you can suck and caress it Note 1: Reika must show her breasts Note 2: [If the left and right breasts are touched at the same time, the first touch is: sucking, the last touch is: touching] v1.1.2 [BUG] ●Mouse sensitivity default correction ●After the settlement animation, you cannot have sex normally. v1.1.1 [interface] ●Added game settings [Screen][Control] tab. ●Added mouse sensitivity setting. ●Resolution-related changes to the drop-down menu. [Function] ●Added [Next Week] button. [BUG] ●Some animation and lighting corrections. ●Corrected the transparency judgment of stockings. ●Correction of dialogue window judgment has been corrected. ●Correction of achievement triggering function. ●Correct the initial position of each room. ●Delete the black cutscene before the scoring animation. [VR BUG] ●VR Corrected the [Dirty talk] playback frequency function of the game settings. ●VR If sex ends with sexual intercourse, switching POV will cause the Xray window to go out ●After two consecutive sex sessions in VR, the cutscene effect did not appear. v1.1.0 [interface] ●Some translation corrections ●Condom button switch identification [Function] ●Added automatic cleaning settings ●4K resolution is changed to Ultra, and to 2K (2560x1440), 4K (3840x2160), 8K (7680x4320) resolution [BUG] ●Stockings will disappear under water ●After triggering the promotion relationship, the window perspective function becomes invalid. ●Automatically put on condoms without closing the see-through window ●Correction of some FPS lens angles [VR-interface] ●VR-Game settings add POV camera effect switch (replaces the original correction lens function) [VR-Function] ●VR-A and X keys are grab buttons ●VR-Y key can call game settings ●VR-B key can quickly switch [first person] [default] ●VR-During sex, press the left selection button to drag the lens [VR-BUG] ●VR-A perspective window will appear during settlement v1.0.1 [clothing] ●The upper body of the policewoman costume will disappear when settling the account [interface] ●Some text translation issues ●New [System] page for game settings ●[Game Settings] - [System] Added [Return to Home Page], [Exit Game] [Function] ●Change the time spent to spend the day ●Added higher resolution 4K 3840 x 2160 ●New automatic orgasm and ejaculation options in game settings [BUG] ●After Reika gives birth, approaching Reika cannot trigger dialogue. ●Memories can also trigger achievements ●When clicking on ejaculation or orgasm in a non-penetration state, it does not detect whether the see-through window is open. v1.0.0 Initial Release

verodor 2026-03-09 ★ ★ ★ ★ ★

The positive is that this game has some quite sophisticated animations and they are indeed engaging. The story itself is nothing to write home for and the short gamplay-loop makes it that after about 2 hours you have already seen everything there is. Sadly the scripted moments and the progression in the game is very short-limited and basically after you got the girl, there is nothing new to discover. Also the interactions with her are always the same. No real dynamic or change inbetween and also no challenge. Besides that the game has technical issues. With Win11 there seems to be a problem in registering the right permissions for actually using the game. Without permissions the game would not even start but block you before the title screen. This and the very limited progression sadly doesn't allow me to rate it any higher but 2 stars. The potential for a much better result is there but it sadly is not developed any further.

beefenstein 2025-12-30 ★ ★ ★ ★ ★

2 stars for the sex animations. Everything else about this game is just bad, from the terrible dialogue and story to the cringy voice acting and plasticky graphics that somehow manage to go above and beyond to look extra artificial. Maybe it's the apparent use of subsurface scattering on otherwise featureless character models that makes them look like rubber.

werkausburg 2025-12-27 ★ ★ ★ ★ ★

It is an empty game, the character customization is poor and extremely empty, the same with the poses, there is nothing to do in the game, it seems like a poorly finished beta, I don't know why they released this like this, lately it seems like a trend to release unfinished games as complete ones.

Lupiscanis 2025-10-23 ★ ★ ★ ★ ★

Review of 1.7.0 (did not try VR) tl;dr - a decent sex simulator with fairly standard options and a few unlocks. --- Pros : Attractive model (for me) Decent set of positions Pregnancy (including ovulation, fertility, time skip for birth (unseen), large breasts + darkening of nipples) Ahegao Neutral : Cervix Penetration/Womb-fucking via xray that I don't mind but also don't really care about and was highly unrealistic. Ymmv. Cons : Overly simplistic. It is a simulator after all, but there's for instance, no toy selection or anything and a rather simple character customisation A little tedious to unlock footjob, bare and anal sex (didn't see anything else to unlock) The voiced sex lines were.. a choice, some such as 'inject me with your hot meat juice' just sounded dumb frankly, as well as 'bring me to orgasm' like she was an 18th century duchess or something --- Overall a decent simulator but also fairly enormous at 18gb for what it is with limited options. Maybe I missed something.

MikesDK 2025-10-14 ★ ★ ★ ★ ★

I found this way to boring, not only is there no real story, no choices, so its not really a game, its purely a sex simulator no more. I played this on PC and dident try the VR so rating is not for the VR version. But also it has well its supposed to be character creation but you cant really change much other then a few hair colors and hair styles and there really isent much to pick from, you cant even change breast size or height so you cant really do any kind of character creation. Sex scenes are decent but boring and repetitive, having to cum 4 times each for girl and dude to move on feels idiotic. Also feels idiotic when you try something like foreplay and you lick the girls pussy but clicking cum it jumps stright into you fucking her in missonary, so it feels unfinished and untested due to issue like that constantly. Then theres the annoying cam views where you have to zoom in to much to see anything or it will be blocked by walls and shit... Then theres the forced condom use for a very long time which is a bit annoying, at one point it changes to wear meter but it never moves, so i guess its not about it becoming to used and break or something fun, no it just mean you put on a condom which you have already done from the very start? makes no sense. As "story" goes on it also forces anal sex on you which is just not my thing at all so lost some points on that as well.

BlackInk112 2025-09-29 ★ ★ ★ ★ ★

This took me like 3 - 4 hours to finish. It's a good game. Well... it's more of a sandbox really. There's no gameplay, but there's a bit of story, you meet this girl, she likes sex, you like her, you fuck all the time, the end. That's basically it. I really liked Reika, she's got a great 3D model, and the animations are really well crafted, there's small glances, little movements that make her really slutty and kinky. I got her pregnant and I'm not sure if there's more content after that, the baby is nowhere to be seen and I didn't unlock anything else.

vladososina 2025-08-23 ★ ★ ★ ★ ★

Amazing hidden gem Pros: It has kind of plot Great animations Great graphics Best Xray ever seen Dirty talks sound hot Cons: Bugs with camera sometimes Can't cum in the certain positions, it changes to other Only 3 locations Advice: Should be added more locations and customization for male and female

JRelengod 2025-07-02 ★ ★ ★ ★ ★

Its pretty alright, not bad by any means, if you want a bunch of poses and some voice acting with some light story then go for it. This is basically the equivalent of a long JAV where there's story and whatnot. The girl is attractive and fun even if there's limited content and the voice acting isn't exactly great. Still the poses are nice and the sex is actually really good. I suppose if you just play these for the sex you might really like this but don't expect anything out of this world.

Jinxypie 2025-04-06 ★ ★ ★ ★ ★

TL;DR, this game slaps. Let's break this down though. The Bad: Incredibly short, very little little "game play" this feels more like a tech demo than anything else. Essentially the entirety of the game play is spent inside her apartment. You progress the "story" by fucking the girl until you can max out your relationship. There are no dialogue options, there's minimal plot, you can basically walk around the apartment and interact with her for sex and dances and that's it. This is pretty disappointing however... The Good: The best erotic animations I've seen for a 3D game so far and it's not even close. This shit is hand crafted by a true connoisseur, a real gooner, the sex scenes alone make this game a 5/5, it's that detailed alone. What elevates this further is the voice acting and the customization. It all feels very authentic and you can customize the camera and the lighting to work in first person and it's glorious, you really feel immersed in the act. You can get several different x-ray visuals either through her body or with a side screen to see the internal visuals. She can get pregnant and you can skip time from weeks to months after that point. It's pretty great. Some really great cutscenes at the beginning as well that left me wanting more of a story. The Ugly: I had some screen flickering and tearing issues that didn't seem to go away no matter what I did and that's about the most annoying part. No climax animations for the girl if you're eating her out for example, it just auto switches you to fucking her the moment you click on her to orgasm even if you were only eating her out for example. In conclusion: If you were looking for a game or a story then you wont find it here, but in terms of just a tech sex demo for a really immersive experience, Sex Formula blows the other games out of the water. I could see a game like this with a proper story and cutscenes really elevating it to god tier status. But for what it is, it's amazing.

sukapisya 2025-03-19 ★ ★ ★ ★ ★

I am not a lover of these DIY porn games, but here it`s just so good. Can`t remember when i saw so much well produced porn in one game. And that don`t have so many lags as other 3D games on Unity or like UE. Dev definetely deserves 5 stars for his work.

liukt 2025-03-15 ★ ★ ★ ★ ★

Sex Formula is not a game, that's the starting point. There is basically no story, no choices and the user has nothing to do except change the views and lights in a rather poor sex simulation. We are light-years away from the customizations, choice of characters and settings of Koikatsu and similar. I admit I don't understand why this product exists but for me it is truly awful. Extremely boring and repetitive.

Gwidoo 2025-03-13 ★ ★ ★ ★ ★

EN: I tried it with my Meta Quest 3s, and honestly, I don't think it's worth playing in VR. In fact, it's probably a good game in "Desktop" mode. The whole point of VR is to give you the ability to interact with the world as much as possible, which in this game is nonexistent. It's just animations, and on top of that, the POV camera glitches all the time. The external camera and the rest of the game aren't very smooth either. So, for VR: 2/5 . For Desktop: (I haven't actually tried it, but I'm sure it's much better) 3/5 . ES: Lo probe con mis Meta Quest 3s y realmente me parecio que no vale la pena jugarlo en RV. De hecho seguro es un buen juego en el modo "Desktop". La idea con la RV brindarte la posibilidad de interactuar con el mundo lo maximo posible, cosa que en este juego en nulo. Son solo animaciones en las que, ademas, se buguea todo el tiempo la camara POV. Y la camara exterior y el resto del juego tampoco es que vaya muy fluido. Asi que, para RV: 2/5 . Para desktop: (realmente no lo probe, pero estoy seguro que mejora mucho) 3/5 .

rentfree 2025-03-12 ★ ★ ★ ★ ★

best game lately animations are top tier. I think animations are the most important thing in a game, sure the game doesn't have much story. But who goes to a game to fucking read a book right? Just wished there were more girls and updates. Excellent

Fomen 2025-02-24 ★ ★ ★ ★ ★

Literally unplayable on my not so-low end pc: 4060 Ti + 9 5900x. Usual black flashing screen during gameplay with many minute-long stutters and loadings. Is it meant to be played on 5090? So sad, cuz the main gal seem kinda cute, although the game in a whole voiced terrible.

WeaponizedAutism 2025-01-20 ★ ★ ★ ★ ★

From a physics and 3d animation standpoint its one of the best H games you can possibly play right now. with the best X-ray vision i have seen. and very good fluid animation. Everywhere else however the game is bare bones. There are barely any customization options except for a few outfits, only a couple of positions, and the story does not exist basically. pregnancy, while having a lot of potential, feels tacked on as well. I still give it a 4 star rating for what it can become in the future if the dev starts filling in the holes. Currently i would say the game is a 3 star rating. Fun for an hour or 2 after which the content has dried up.

sudio 2025-01-05 ★ ★ ★ ★ ★

Technically speaking its just but another animation viewer but it has something new and special about that makes it interesting. Story and progress Nicely made cut sciences, and progression. You unlock by playing, first anal then possibility to precede without condom. Story is pretty much cougar takes under her roof awkward mute guy to make her cum and eventually impregnate X-ray Best I've ever seen in any game here ever. Different animations depending on pose, if condom is on or off. Even you can see tummy if she's pregnant. Time progression Depending on the day of a month hottie will have different moods. Might be Ovulating, might be bleeding. She might be in bad mood because of this cycle that makes gameplay different for example she wont let you go straight to anal and you have to unlock it by pleasuring her first and etc. You can skip time Day week and month intervals to see the difference. Especially noticeable when you make her pregnant and see her tummy go big. Voice acting Its a Japanese game. Its a miracle that it has English voice at all. No reason to complain about it. Sure its not perfect but definitely more then ok. Controls Very unintuitive and was having much difficulties with vive controller because binding is for oculus controllers. But considering gameplay is super simple and game literally plays itself its not much of a hassle. The most difficult part is to walk. I still struggle with it massively but you don't need to do that a lot. Great vr experience would definitely recommend. Works straight out of box. At least 2 hours to try every animation and gameplay element. Around 15 different outfits. Probably 40+ sex animations and 12 or more dancing animations if your into that. Some customizations like different hair styles and colours here and there

paxtn 2024-12-30 ★ ★ ★ ★ ★

Game graphics are really good. Also the game performance is good, but the rest... The voice actor of the woman is really good, but sometimes voice stops working. This is very annoying in the few story parts. Also there is not really a story. I wish there was more story or different models of the girl. With some improvements, this could be a good game. In this state, the game is a one time fap, delate and forget...

Mr Saxobeat 2024-12-08 ★ ★ ★ ★ ★

Gameplay is meh and wish it was longer, but nice game for a fap .+1 for Animations, hope better gameplay games will come with animations like this. All and all i have enjoyed it a lot. 5/5. Dev please make more and more games like this. I like it when animations are not vanilla

idonthaveaclue 2024-11-25 ★ ★ ★ ★ ★

Not so much actions needs to be taken by the player, which is usually not something I would like for a game Basically just a CG player with a lot of scenes. But the heroine just SO GOD DAMN TO MY TASTE I don't think I have a reason to give an excellent rating for this.

sentry_mo 2024-11-06 ★ ★ ★ ★ ★

Great for desktop, idrc about VR. Good animations, voice acting and customization. There are a few issues that hopefully get patched; such as hair being too bright, and the succubus decals covering the cross-section view (which is one of this game's best features, however the visibility of it is based on the camera's distance to it).