Basically nothing, anything somebody else is fucking is never in a relationship with you, choices that make any girl even the slightest smidge interested in someone else's cock is cast into oblivion, discarded to the "I'm not in any relationship with that *stranger*" box.
If you let any girl get raped once, she is locked out of the romantic options, basically, like "One drop of cum that's not mine is inside you? Ew. Begone!"
There is one scene where a love interest may get raped, but the scene is portrayed as the most reprehensible thing that could *ever* be done to someone (despite the protagonist raping multiple girls already) and then she's drugged so she forgets about it, the guy that raped her has a smaller dick than you, he is pathetic, and this "NTR" is never mentioned again, since she doesn't even remember, it's like it's never happened. (Basically a soft retcon)
The funnier shit is when you watch the teacher have sex with the principal. The female teacher is someone that you clearly hate, you don't know each other to be in any relationship, and there were no romantic implications between you two, but because you see her fucking someone else, the retarded Dev "Labels" it as NTR.
