Is there any way to shape the buttocks and hips? any mod or something?
You don't need a mod, because you can literally modify EVERYthing. I am unable to give you a detailed guide (bc I'm not playing the game atm). There is a edit tab for every preset and you can even create a woman from scratch.
I have faith in you, you gonna find it yourself
And a note to all these "This is a tech demo"-blabla: This is a fuck simulator. Yes, you could also tag it as an "Animation Viewer", but ya'll don't seem to understand the game mechanics.
It's 99% sandbox.
You kinda build your own "story", more like directing a single scene of a porn movie.
Over and over again.
If you were looking for something with immersion, storytelling, progression, then this game is not for you. Time to accept it and move on.