either an affection stat that if its low enough its hard ntr or you can tell her youre into the idea of her sleeping with other people and she does that. Both paths possibly leading to earlier impregnations for those she sleeps with
I don't know about that, but I could maybe do an NTR focused character? Like, on her dating page, she would be like "I WILL sleep around with other people" And, maybe she sends you lewd images of her sexual exploits :D