I also remember I had issue with the requirement of "Willing to have sexual encounters with more than one gender(s)" to be a member...

Part of that is because I've seen, in way too many groups, the unspoken implimentation of the "Bi Cooties Principle". Girls playing together is cool: guys playing together is not, and you get all these uptight people who will play, as long as they don't get touched by someone of their same gender.

It's impossible to relax and flow into the power, if you're constantly worried about someone freaking out if your hand touches them, or if your cock brushes their ass, or if your lips find their nipple.