So I finally have an idea for how I could have a hand at MCing Apocalypse World for my local friends here in Nanjing, but to make it work I think I need to make a change to the sex-oriented "special moves." Some of the participants (including myself) would definitely not be comfortable with the sex rules as they are in the game. It's not that we believe sex is evil or anything, just that it's private and we don't want it to take such a big role in our game night.
So I'm considering changing the sex moves so that they apply to any time you make yourself truly vulnerable to someone else -- if the players really wanted, it could include off-screen sex, I suppose, but it could also involve confiding in someone, sharing your true feelings, revealing something about your past, or any number of other situations that often come up in life. It could be up to the parties involved in the roleplay whether or not their interaction really counts as sharing vulnerability.
I'm also thinking, possibly, this would have to be a mutual thing, so that the characters would both have to make themselves vulnerable to one another, such as both confiding, both sharing feelings, and so on. If only one character makes him or herself vulnerable, then that's really something else entirely, opening up the possibility for one character to take advantage of another.
Would this break the system? Does it absolutely have to be sex and nothing else? What other solutions to this problem haven't I considered?