Regarding female membership and activity generally, those are interesting statistics about male & female members membership, but 55%/45% doesn't reflect the actual activity that I see personally.
When I look at discussion posts, it is ALWAYS many more men than women who are posting. An exception might be a post that is directed specifically at women member.
For example right now on my Discussions > Recent Unseen, here's what I count- 44 male/11 female. That's 80%/20%. That is far more representative of what I usually see on Zity, a lot more men active than women. It's really never close to 50/50.