Well, I can anticipate a yes answer to the second question. But I'm writing this post to remove some weight out of this assertion.
In one of the comments on RockPaperShotgun's piece on Polymorphous Perversity, someone said it would be too pretentious to me, as a developer, to expect players to learn more about their sexuality by playing a game like this. Though I never made such claim (that one could learn about his sexuality playing Polyperv), it could be true depending on the weight you put on that.
For instance, if you go to the market, try a fruit you had never tried before (like this), and end up enjoying it, you'll have learned something about yourself, won't you? That's as far as my pretension goes.
For that matter, there are many things you can do in Polymorphous Perversity that have very little impact on the game itself. For instance, once you learn the masturbate skill, you can use it anywhere (literally, anywhere). Though it has an impact inside battles, it's purely aesthetical outside of them.
Still, I expect players to do it. Maybe a little, maybe a lot. But if they do it, it will be for purely sexual reasons.
Another example, based on things I've been reading about balloon fetish, I added some balloon stuff in the game. There is a balloon item that is somewhat difficult to obtain, and you can sell it for money. Or you can just pop it, which does nothing but visual and sound effects of a balloon popping. I expect some people will pop it. Maybe once, maybe twice, maybe more. Why would they do that?
There are really a lot of instances in the game where players can opt to do sexual stuff. Sometimes they have an impact on the story, or game mechanics, but most of the time they don't. Still, players will do those things, and it's safe to say, to me, that it's out of sexual reasons. They might do it without thinking, they might do it consciously, or maybe self-consciously. And then they may go "what the hell am I doing?", and that's the point where you can start... observing yourself.
I shouldn't be making a post about this, because it can bias player's behavior inside the game... like I was there watching, saying "told you so". But not many people have been reading this blog anyway, so... eh.