http://www.digitalweddingforum.com is my favorite forum for professional wedding & portrait photographers. I'm a member and an advertiser. It's a pretty great resource if you want no-nonsense business/technical photography info.

Membership is in the thousands and it's a paid forum, so it's profitable.

I don't know the actual numbers, but portrait and wedding photography has become very popular with women in the past few years. There are a lot of women that participate (possibly a majority).

There is also a women/mom photography forum called http://www.clickinmoms.com that is fairly popular, but I have no first-hand knowledge of it.