Banter and teasing are actually big ones, and comfort level. Basically he has to be relaxed enough with the person to start letting guards down. He's also more physically attracted to people around his own age or older. He can be physically affectionate with people younger than him, but for the most part he's not as likely to get turned on by it.

I think that's about it. Mm...

If Mukuro was going to design a game where anything goes and no one would know who created it, what kind of game would he create?