Procedural Penis Animations/Collision [Beta]

[Budoop]

Genuinely baffled at how well this works, why did this not exist years ago?

Running on P+ as a futa, only issue is some of the anims not lining up which prevents the mod doing its thing, but that's due to some dodgy load order stuff I need to fix.

 

Bravo man.

[sikamikanico78]

"their roots go deep..."

 

thank you for this amazing mod!

 

 

 

 

 

[milklover123]

My god what a technological breakthrough!

[SuzaySeyzhai]

I know these are axis positions, but are they in X,Y,Z order?

[imauto93]

The pain of adjusting the position of animation files while struggling with different body types and sizes has disappeared thanks to this mod.

It works fantastically well. Thank you.

Spoiler

 

[asdt123123]

10 hours ago, Kryp67 said:

skyrim vr ostim... release 14 no more crash on start but mod doesn't work at all. could be outdated ostim 

OStim's VR is outdated and unsupported. If the update on their github page ever makes it to Nexus you'll be good to go but it seems abandoned 

 

9 hours ago, seriousssam said:

She doesn't open her mouth, I can't understand what the problem is. The vagina and anus work fine, but the mouth doesn't want to open. I installed the [Predator] mods and last version of PPA - Penetration Physics. I'm use FSMP.

This mod doesn't handle expressions. That would be your sex mod's problem. Sometimes other mods like YPS can break the facial expressions too when updating the hair. 

 

11 hours ago, yavushev said:

In the new version, everything is fine. The penis isn't flat, but like in previous versions, the entry point needs to be adjusted slightly. During vaginal sex, the penis needs to be positioned very high, closer to the back wall of the vagina. During oral sex, the penis enters lower than it should. I solved this by replacing this with [MouthPosition]: { "Anchor": "NPC Head [Head]", "Offset": [ 0.0, 1.0, -1.15 with this MouthPosition": { "Anchor": "NPC Head [Head]", "Offset": [ 0.0, 3.0, -1.15The bottom screenshot shows the modified input

Yeah it'll be a little different for everyone. The mouth bone doesn't actually move with the mouth perfectly for whatever reason. 

[asdt123123]

2 hours ago, SuzaySeyzhai said:

I know these are axis positions, but are they in X,Y,Z order?

Yeah but Z on skyrim is up/down. And these positions are relative to the bone it's anchored on. I just put +5, see which direction it moves - and go from there. 

 

7 hours ago, Budoop said:

Genuinely baffled at how well this works, why did this not exist years ago?

Running on P+ as a futa, only issue is some of the anims not lining up which prevents the mod doing its thing, but that's due to some dodgy load order stuff I need to fix.

 

Bravo man.

P+ has some weird alignment issues for me too sometimes that don't exist on SL. 

 

Edit: As for it not existing ages ago idk. But Skyrim's engine has a lot more potential then what people expect. I posted dynamic leashes awhile ago just using basic IK solving. There's some extreme goon potential with this game. The only limiting factor is this annoying 4 bone per vertex limit, and 80 bone total. 

 

9 hours ago, BeefyJackal said:

This works very well with Ostim SA! Does anyone know how to add better compatibilty with males? I changed the json to work with males and it works for most anims, but some anims have a problem with the penis "popping" out before the penetration. I´m using HIMBUTT and males have working anal collision. 

 

EDIT: Okay I noticed that the penis is trying to go too high up, meaning that the anus is actually a little bit lower on the HIMBO body. I´m using the BHUNP version btw.

Ur gonna have to make an override config for males with different offsets, with a male predicate. Review the config section for more information. Unless you just want male on male with no female, then you can just use the main config. PenisActivateRange will prevent that popping effect. 

Edited January 10 by asdt123123

[Ameridaw]

This is goddamn brilliant. With Hi-Poly head, Sexlab Sex Sound, and P+ (supplemented by Hentairim P+ to return stuff like position adjustment buttons), now this, I'm just baffled at how much the game's been improved over the past year. Modders, I bow my head. With this mod in particular, the fact that I can just edit the json and update on the fly without having to restart the game, god that's just bliss. 

[GusCrow]

You probably know that, but Ostim NG is the old Ostim not supported anymore. Ostim Standalone is the current one. Sometimes some people gets confused and installs the old Ostim thinking it's the latest.

[Redflyingmonkey]

On 1/9/2026 at 9:51 PM, asdt123123 said:

 

 

Do me a favor and just try different versions of HdtSmp64 - like with AVX1, AVX... etc. If those still fail, try FLEX HdtSmp64. If that fails, lmk and I'll just have to delay my injection til these plugins are done doing weird shit 

Heya boss. So I'm not getting a crash on AVX but it's not working (obviously, I have an Nvidia GPU). It's not using my 9800x3d more than it used to either. FLEX works, but it somehow uses 99% of my GPU on a clean install, so I'm wondering if the problem isn't coming from my hardware. PC is new though, nice rig with a 5070ti. Maybe drivers ? I have no clue. 

[asdt123123]

1 hour ago, Redflyingmonkey said:

Heya boss. So I'm not getting a crash on AVX but it's not working (obviously, I have an Nvidia GPU). It's not using my 9800x3d more than it used to either. FLEX works, but it somehow uses 99% of my GPU on a clean install, so I'm wondering if the problem isn't coming from my hardware. PC is new though, nice rig with a 5070ti. Maybe drivers ? I have no clue. 

Can't really say since nobody else seems to have your issue. To me it seems like another mod may be corrupting memory. Like that Flex mod for example has a bug where it breaks SKSE's task system for a short bit. 

 

Also make sure you elaborate when you say "not working". Like what isn't working, what does the AccuratePenetration.log look like, etc.

 

And are you positive there isn't another mod messing with FSMP? It's weird flex is at 99%, could be indicative of you having another mod injecting into flex, but incorrectly since it has a different layout. 

 

I've attached a version that delays the hook time. However, even if this fixes your issue you should go over your mod list carefully. Your skyrim is acting very strange - like I don't even think MenuOpenCloseEvent would/should be getting called at the main menu. 

 

1 hour ago, GusCrow said:

You probably know that, but Ostim NG is the old Ostim not supported anymore. Ostim Standalone is the current one. Sometimes some people gets confused and installs the old Ostim thinking it's the latest.

Yeah there's so many of them. Even a custom one specifically for VR. 

PPA - Penetration Physics v0.0.14.zip

Edited January 10 by asdt123123

[tridbee]

On 1/8/2026 at 12:33 AM, asdt123123 said:

Review the config section. It wont extend the penis, but you can retain a penis's shape/lenght

Maybe I didn't phrase it right. What I meant is a settings to adjust the scale of each individual penis bones while penetrating. Once the penis bone is inside, it is scaled immediately to the scale set inside accurate-penetration.json.

[w9369]

15 hours ago, BeefyJackal said:

This works very well with Ostim SA! Does anyone know how to add better compatibilty with males? I changed the json to work with males and it works for most anims, but some anims have a problem with the penis "popping" out before the penetration. I´m using HIMBUTT and males have working anal collision. 

 

EDIT: Okay I noticed that the penis is trying to go too high up, meaning that the anus is actually a little bit lower on the HIMBO body. I´m using the BHUNP version btw.

Could you please send me your JSON compatibility file so I can learn how to set it up? Thank you.

[Azazemon]

I gotta say, as someone who likes to figure out how to make a mod work before coming to the forums, your directions on how to configure this is very good. I managed to get this working for male and female animations quicker than I thought I would.

[Lenin69]

17 hours ago, seriousssam said:

She doesn't open her mouth, I can't understand what the problem is. The vagina and anus work fine, but the mouth doesn't want to open. I installed the [Predator] mods and last version of PPA - Penetration Physics. I'm use FSMP.

This mod helps the PC's mouth open (sometimes). 

 

[seriousssam]

Very Thanks! Rewrited "Offset": [ 0.0, 4.0, -1.15. It's worked!

 

Edited January 11 by seriousssam

[BeefyJackal]

8 hours ago, w9369 said:

Could you please send me your JSON compatibility file so I can learn how to set it up? Thank you.

accurate-penetration.json Here. Please let me know if its working for you. I made this for HIMBUTT using SOS/Himbo/BnP. 

[BeefyJackal]

Any possible way to change which JSON file it reads in game? I´m using one for female and one for males, since the anus bone is located differently. I am veryvery bad at coding, but perhaps there is some keyword we´d be able to add so it would know which parameters to use. Then we could use the one JSON? 

[w9369]

37分钟前，BeefyJackal说道：

有没有办法在游戏里更改读取的JSON文件？我目前用的是男女不同的JSON文件，因为男女的展望角度位置不一样。我的编程水平很差，但也许我们可以添加一些关键字，让游戏知道使用哪些参数。这样我们就可以用同一个JSON文件了？ 

谢谢分享。

[Legend0fJan]

This mod is absolute magic! It would be cool to have a toggle button for overriding Sexlab Animation tags later down the line and just being able to manually toggle what hole the dick should go into.

[as5685009]

In doggystyle animation vaginal seems opened a bit high i tried adjusting the settings to lower the vaginal height 
After refresh nothing change its adjustable?
And in ostim sa scene if you have used anal animation to open anus once all vagina and anus animation two holes open at the same collision
Not sure other people have same problem to

Spoiler

  "VaginaPosition": {
    "Anchor": "NPC Pelvis [Pelv]",
    "Offset": [0.0, -1.0, -1.3],
   

 

Spoiler

 

Edited January 11 by as5685009

[JL28]

Could anyone whos managed to get their characters/npc penis to bend down the throat during blowjobs post their Mouth position setup? I tinkered around with it a bit and couldnt figure it out. Also, anyone else have an issue where characters balls wills get sucked up in to the ass/vagina during certain animations?

[Mister X]

On 1/10/2026 at 3:23 PM, sikamikanico78 said:

"their roots go deep..."

 

thank you for this amazing mod!

 

 

 

 

 

 

@asdt123123 Now I'm curious, what would happen if she bows her head back and overstretches her throat? (like lying on her back and letting her head hang off the edge of a bed)

Would the penis stay in her throat, pop out below her chin or would this depend on which node was used as anchor for the depth waypoint(s)?
One the other hand you mentioned that for the head the anchor nodes are unused, is that still correct?

Edited January 11 by Mister X

[asdt123123]

4 hours ago, Mister X said:

 

@asdt123123 Now I'm curious, what would happen if she bows her head back and overstretches her throat? (like lying on her back and letting her head hang off the edge of a bed)

Would the penis stay in her throat, pop out below her chin or would this depend on which node was used as anchor for the depth waypoint(s)?
One the other hand you mentioned that for the head the anchor nodes are unused, is that still correct?

Predator pointed at to me there was actually a throat bone. So it will properly follow the throat always. 

 

6 hours ago, as5685009 said:

In doggystyle animation vaginal seems opened a bit high i tried adjusting the settings to lower the vaginal height 
After refresh nothing change its adjustable?
And in ostim sa scene if you have used anal animation to open anus once all vagina and anus animation two holes open at the same collision
Not sure other people have same problem to

  Hide contents

  "VaginaPosition": {
    "Anchor": "NPC Pelvis [Pelv]",
    "Offset": [0.0, -1.0, -1.3],
   

 

  Hide contents

 

The physical opening is entirely at the will of the body. You might want to try a SMP setup if you want more accurate opening physics. 

 

For anal+vaginal tagged animations, your only really option is:
1: Get the penis to point away from the anus. Including the tunnel waypoints

2: Or Shrink the collision sphere of the anus/vagina and or the penis girth. 

[redhat42]

Bro, and here i was thinking why nobody have tried to implement this mechanic as in honey select.

Works like a god damn charm, from the box.