Although I don't read LessWrong much any more, people always seemed willing to talk about their actual beliefs in depth. It's about as male-heavy as HN, I guess. There was, a long time ago, some controversy over 'here's what you need to do to get more women', which, as you'd expect, enraged a few folks.

I actually don't read LessWrong itself, but I've interacted with lots of people and sub-communities that are associated with / spun off of the rationality movement. These were just rough pointers to directions I've followed to find higher levels of quality discourse. Ribbonfarm is another such community.