Ah. I'd assumed you were familiar with it. My bad. Yes, the mentors are gay, and are of at least Dumbledore-level importance.

Because, really, I was talking about the Duane books that I thought were YA that have important gay characters.

As for having sex and talking about it, one of the more amusing compliments that I got for Nevernever was from someone saying that the best scene they'd encountered in YA fiction about first-time condom use involved a werewolf. The characters definitely talk about sex while having sex, and though they don't talk to anyone else, everyone in the place knows they're fucking.