I've made some tests using soft body Animations, to make my life somewhat easier to animate "realistic" (definitely not even somewhat close) vagina and butt insertion
it looks promising to be implemented in the Meshes I use, the only giant downside I see at the moment is baking, and simulation errors...
I definitely need to play much more around to see what would be best, I've also come up with a Shrinkwrap method but I need way more testing for that, I'll find some method probably, if not then I'll stick to the good old traditional keyframing method.
Stay safe
Bleden