oh yeah, it's a corruption game - she is not a slut to start with, but your choice corrupts her more or less or not at all. the corruption pace is slow at the beginning but with some hard work and time you can transform her. Honestly though, the point with corruption game is to corrupt so you might as well go all in and maximize corruption and don't half ass it

you can chose not to have sex with certain persons in certain situations without penalty (still keep her on a steady corruption path) so you do have some flexibility and do not always have to choose the most slutty path.