I don't think it's possible to make a porn game where the guy has multiple partners realistic. In real life even guys who get a lot of action aren't banging every single hot woman they happen to cross paths with.
Plus a story about a guy having a bunch of one night stands (which is the only realistic way he would get that much action) would be pretty boring.
If realism is a big deal to you then unfortunately I don't think you will ever find a game that