Of course, I don't expect you to teach anybody to to 3D object creation and/or rendering. I have some knowledge of this. Starting to learn more and more. Learning about mesh-modelling, lighting, texturing, rigging and animation.

What I have never seen answered (probably, because it's too specific) is how to have a soft object give way to another like a vagina opening when a penis or other object enters. That it opens up around the object. And that in such a way with realistic deformation.

What also would be interesting to be able to do is realistic tearing of the vagina and breasts if torn off. That would be hard to do, wouldn't it?

And things like tearing off skin also seems extremely difficult.