I have a suggestion... (which was kind of obvious, since I'm posting in the "suggestions and help" section)..
Since you already have a space for 'Location' & 'Mood' in the box underneath the avatar...How about having a field with 'Age' & 'Sex', like myspace does.
Some of the usernames cause confusion here, and people make assumptions about the Age/Sex of the people they are talking to.
It could be done in the same way as the 'Location' field is done, making it optional for FMs to put it in.
Just a thought.