What about a subforum named 'Activism'? Those who want to look can do so, while those who don't can stay in the main forums. I get the feeling, however, that your audience would probably be limited to a dozen (or fewer) regular contributors regardless of where it's located. In addition, the rules on 'political discussions' might have to be somewhat modified (or at least clarified) for such a forum as activism is pretty much inherently political.
I realize that 'Have you slept with a guy' doesn't constitute a serious discussion of the sort I imagine you're contemplating. I don't see anything in the FAQ/Rules forbidding frank discussions of sexuality as long as nobody's posting images or using 'foul language', though I'm not sure if the rule against 'explicit sexual content' might shut something like that down.
Likewise.