never crossed my mind that this game might be considered ntr or cuck... I mean, as someone else said, you don't really get attached or care about any girls. Denise, your GF, get's fucked by the black guy ? Hurray, who cares, you see her like never, she's your "GF" in name only and considering how you got her and what's in her head, she wasn't someone who you'd bring home to meet the family.
So...can't talk about ntr or cuck in this game, just enjoy the sex scenes, that's all there is. This can't compare to DmD, Big Brother, etc, it's a completely different situation.