honestly i dont think forcing someone into it matches the style of gameplay its about not being seen
id argue there should be phases each girl remembers you
but to start sex you need to walk up behind someone and place your cock between their legs while they walk to provoke a lewd interaction
this would make them taunt you and point somewhere at which you start breeding them when you interact with them
the spot can make it harder to breed them things like light poses and how popular the area is can all be factors if the cops get called
poses would be up to the player but the girls might request a pose which would increase their love for you
girls who love you wont leave they will just cover up
this could also help players with their tasks