A fetish is surprise sex or sleeping sex with a consensual partner(you agreed on it previously, I believe it is known as free use), non-consensuality is just rape, now I'm not against the dev putting it in the game as long as I can choose not to do it, but it isn't a fetish.
edit: not everything sexual is a fetish, now again, I understand if the dev wants to put it in-game, and I also understand that there are people turned on by it, some just in games(I hope), so I don't have a particular problem with it, same with the loli content around. Basically, I agree with what you mean, just not how you phrased it. Also rape fantasy can be there, but again consensual.