The purpose of the game is to embrace the greatest number of possibilities. There will always be a range of the game that is a "no no" for someone, but there is always the rest of the game to play. Having NPCs living their lives around the city and having relations is just a normal thing. Not cuck-ish imo. I see that some players are sensible to catch NPCs having sex. Even with NPCs that are not related to their chars. Honestly, I don't intend to lock this kind of behavior (NPCs living and having sex with their partners). But now (v0.1.12) you have the possibility to configure the city behavior, so NPCs are generated with a higher level of chastity. Shy NPCs will not have sex in public places. Beside it, you can remove any gender you don't want in the city, etc.