And it's not NTR. You aren't in any kind of relationship with her. She has sex with her boyfriend ... or perhaps fuck-buddy is a better term ... once ... and then dumps him soon afterward, thus making her available for the MC to pursue. If that's NTR than there's a whole shit-ton of NRT going on as every husband and wife in town is NTRing up a storm in their houses ever single day. I assume most people understand that not every woman stays a virgin their entire life just on the off-chance that the MC and his magic dick will turn up.
If you object to any woman in the game ever having sex with a guy that isn't the MC, then yes, there is some.
If you object to a woman who is in a relationship with the MC going off behind his back to have sex with another guy, then no, there isn't any.