Hey -
I don't know all the rules or etiquette about this, so if this is out of line or simply impractical I'm sure you'll let me know... but would it be possible to insist that all forum users posted an avatar? Or that all avatars were actually of the users him/herself? Or at least that the avatar was the same gender as the user?
That wouldn't necessarily require a picture of the naked gentalia, but at least something representative of the person.
I've heard more than one complaint already in my short time here (since Jan) of users not being able to tell the men from the women, or that a real woman is impossible to find here, and similar things. So while I'm sure I'm a bit 'old-fashioned' about being able to know something true about the person I'm talking to, I'm not really alone in the feeling that one should accurately represent one's gender.
It's probably unenforcable, but I wish there was at least some sort of control over this. Personally, I find it strange and disconcerting that men use female images as their avatar. Or vice versa (although I'm not aware of any women using pix of men for this). The nature of the internet allows anonymity, sure, which leaves it all open to dishonesty or role-playing, but still. I wish there were a way to control this.