I would make money in UO sometimes by logging into a female character and “bowing” in front of people to make it look like my character was performing oral sex. You could also spam “bow” while the other player spammed “salute” while standing behind the first player to look like doggy style sex.

non-ethical monogamous situationship

So … sexual slavery?

I’m having a hard time coming up with another situation that fits that description.