Guys, joke aside, NTR is closest to vanilla, among other fantasies. You are cucked, but in (almost) every p0rn game or other content Woman's will is nonexistent. In NTR at least she wants to fuck with someone and you, as player, don't decide with whom. She has free will and choose someone other than you. So woman is, actually, closer to real person. Also this is normal, when we have for example 6 women and 6 men and you can fuck 1-2 max, other will choose other partner. That is why it is perfectly OK if Lisa has sex with Alex (when you choose Olivia), mom with Eric etc. These woman will fuck who they want, not who you want.