The above conversation is why I added dialogue options to let the player choose how much hypothetical flexibility they give the girls' sex lives.
1) You can welcome them to sleep with whoever they want, that's what you're doing after all, and on this path you have no double standards about that.
2) You may invite them to sleep with anyone in the harem. Girl love rules, says the protagonist on this path.
3) You can also tell them that you only want them to sleep with you. This one is hardest to justify, but for jealousy-prone protagonists, they might not like the idea of any of their 70+ girls sleeping with anyone else.
The game doesn't cover absolutely every event. It's implied that while you're shopping and sleeping with many girls, Ray and Bessie are off doing other things. If you picked (1) they might be engaging in the same kind of business as you, but given the state of the world, it seems unlikely that they'll find another male lover anyway unless it was at a Capital City brothel. Whether you think going to a brothel is beneath the girls, that's entirely up to your own personal head canon. I was going to add optional scenes where Bessie could hire escorts, but I decided that it would be too different from what the game is already about.
Your harem, on the other hand, is likely brimming with a lot of love if you picked options (1) or (2). I'd love to represent this in some way, but some things are beyond the scope of the game. I may add several unique threesomes with interesting harem combinations once the main story is complete that can help flesh out the sense of community within the harem.