I mean, what, sex moves? I haven't really investigated the production but as far as games go that's a major alarm bell right there, I don't mind playing in someone else's imagination but not their creepy fantasy.
The sex moves are really a mechanic about relationships. Not only don't they require you to get into some sort of creepy sexual fetishist detail, they actually serve to discourage that by having a sterile mechanic kick in at the point where you'd otherwise have an opportunity to transition to that sort of thing.
The game basically performs the "fade to black" for you. While you certainly
could choose to turn the lights back on and describe your character's sexual experiences, the game doesn't encourage it or even suggest it. In practice, these mechanics encourage the PCs to form really intense emotional relationships with each other... and then tear those relationships apart because there's still an incentive to go hook up with somebody else.
You know how a lot of post-apocalyptic dramas feature a group of characters who emotionally tear themselves apart even though the rational course of action would be to band together and trust one another? This is how
Apocalypse World organically achieves that dynamic and it works.
But because it uses the word "sex", virginal neckbeards get upset about it. If it really bugs you, you can replace the words "have sex" with "start dating" and the mechanics of the game won't care.
A few examples that might help clarify things:
Battlebabe Sex Move: If you and another character have sex, your Hx with them on your sheet goes immediately to +3, and they immediately get +1 to their Hx with you on their sheet. If that brings their Hx with you to +4, they reset it to +1 instead, and so mark experience.
Brainer Sex Move: If you and another character have sex, you automatically do a
deep brain scan on them, whether you have the move or not. Roll+weird as normal. However, the MC chooses which questions the other character’s player answers.
Driver Sex Move: If you and another character have sex, roll+cool. On a 10+, it’s cool, no big deal. On a 7–9, give them +1 to their Hx with you on their sheet, but give yourself -1 to your Hx with them on yours. On a miss, you gotta go: take -1 ongoing, until you prove that it’s not like they own you or nothing.
And so forth. You'll notice the complete lack of mechanical reach-arounds and blow-jobs.
So its just a system? For pity's sake.
In much the same way that D&D is "just a system": The mechanics of the game are not tied to a specific setting, but any game played in the system will clearly share a common milieu. It's setting from the bottom up instead of setting from the top down.
also the sex moves are one main way to increase Hx, or history with a character
That's radically inaccurate.
Only 3 sex moves (angel, chopper, driver) have anything to do with Hx at all (and one of those is Hx neutral -- one character gains Hx while the other loses an equal amount). The other 8 sex moves (battlebabe, brainer, driver, hardholder, hocus, operator, savvyhead, skinner) have nothing to do with Hx at all.
It's actually really trivial to end up with a group who doesn't have an Hx-associated sex moves by pure chance. And even if you do have an Hx-associated sex move in the group, it still won't be the primary method of gaining XP.