I have to say that all this talk about nameless henchmen and “reward” NPCs seems pretty alien to me. NPCs rarely accompany the PCs on their super dangerous adventures, and if they do, they certainly have names, motivations and personalities. And sure, PCs might sometimes have intimate relations with some NPCs, but these are not some sort of “trophies” or “rewards,” they are just people, behaving as people do. And, yeah, in my current campaign the NPCs the PCs have had such relations have been predominantly female, as it is mostly the party’s rogue who engages in such activities, and she seems to be pretty strictly a lesbian.