Firstly, it has to be said using Google maps to select your location is a very, very time-consuming operation. The facility they provide for non-UK residents took about 2-3 minutes just to find my location. I also got my location wrong on the first attempt, and I had to completely delete my profile to update my location.
But the biggest usability issue is this one:
Firstly, I think there are probably many users of the site that wouldn’t get the subtle distinction between these two icons.
Secondly, this type of icon/widget is used on the Mac OS (and I suspect other sites/operating systems) to signify an avatar (an icon you can use to identify yourself – usually a photo or some kind of character icon). I initially missed that it was a question about gender and thought it provided the ability for me to upload an image.
Lastly, what do you need to know my gender for?
Anyways – it’s a good cause, so worth checking out despite these flaws – just be sure to get your location right first go 😉