Something you need to think about when you read reports like this is they are talking about an average over a (normally small) sample group. Not to say this doesn't produce useful data, but it is far from the last word.

What really gets interesting is, outside of the obvious "naughty bits", its sometimes hard to figure out what makes a man a man and a woman a woman. As DNA research becomes more common and noninvasive body scans cheaper, we are finding all sorts of surprises in people who are totally "normal" in appearance.