This game is incredible, really fun to mess with it.
Here's some things I would like to see in future releases:
Some way to save the appearance of the girl you made.
Hands and a mouth, being able to grope some parts of her, and kissing/sucking some others is really needed.
Anal and oral sex. With oral, i think that making so she only turns her head sideways would be the best way to make it, you would only have to redraw the head customization to accommodate that, but if oral isn't in your plans, i can totally understand.