Do bikini models often end up doing nasty soft core nudity...?

my gf is trying to become a pin up model.. she has already taken shots in lingerie.. .. IT WAS HOT.. i mean . she is gourgous...!!! I am pretty okay with this because its basically wearing a bikini.. so thats fine.. but . i dont want her falling down a slipery slope where she may end up showing the goddies on film.... .. like.. i can understand her pushing the envelope with implied nudes.. maybe...!! or at least implied topless.. like something out of maxim. .!! stuff... but ... nothing more... !! how do i keep her on the okay path.. !