It's entirely up to you, I wrote the game in a way that it doesn't forces relationships on you, you decide who you bang ofc, some will be easier to do some will be more difficult. But ultimately it will be up to you how you do it, you can have a friends with benefits sort of relationship with them, blackmail, date, even marry some of them all that will be in there. And that's not just for the ones you saw, even for future ones you can destroy marriages, steal other people's wives girlfriends etc. Just pay attention to the dialogs and don't ever roll back on them.