Hey dev, great game, great idea, great execution but would be real good if sharing was avoidable too, I mean the idea of anyone sleeping with the protagonist's wife is basically him getting cuckolded, so since cuckold is avoidable I think in the future updates it would be cool if sharing was avoidable too, I mean I'm ok if Rina flashes her boobs and all to other characters but straight out sex of any kind? Nah don't like that idea very much.
If I sound confusing then lemme put it this way, A seperate branch where Rina may tease other male characters but never get into sex, oral sex or similar with them, that's exclusive to the husband, a path like this would be super cool, hope you consider it.
Good luck with your game.