Sorry. I was at a regional burn and away from the 'puter for a few days.
Anyway, the guidelines we have were already explained, and we'll probably get a sticky up soon with them for future reference.
You're welcome to talk about sex. You might want to include a warning in the subject header ("EXPLICIT") to let folks know there's gonna be nudity and a lubrication splatter zone involved. If the sex discussion is centered on poly issues, it's all good. (Instructionals on fetish play, though, would be directed elsewhere, as that isn't the focus on this site.)
So feel free to get naked.