I used to be involved, but one day before an event I found myself seriously considering having a tshirt made that said "No you CAN'T tie me up and I'm not interested in girls!" In the hopes that I could maybe have an interaction with some one that didn't involve me actually saying those exact things out loud more than once.
I was so disgusted by the realization that I was actually considering wearing a sign so people would stop "forgetting" that I am dominant and straight. I decided I didn't want to have anything to do with it anymore.
Not that there is anything wrong with being sub or switch and bi or lesbian. I'm just not. And I really should have been able to say "this is how I am" and have the majority of people accept that. But they didn't. I ended up feeling like there was something wrong with me. My experience was that a lot of kinky people are even more close minded than most vanilla people.
I live in a populated enough area that I'm sure I could find some different groups, but I'm not really interested, right now.