Secret of the Sexes, BBC Documentary, Episode 1, 3. Brainsex

Men and women are just the same. Just as caring, just as promiscuous, just as good at a three point turn. Aren t they The results of a new BBC sex survey of 500, 000 people from around the globe the largest ever carried out provide very revealing answers. And five men and five women are put through a unique battery of experiments to uncover the real differences between the sexes. Engineer Lloyd finds out what s missing in him. Bickering couple Liz and Craig squabble over who s the most empathic until a stunning brain scan settles the argument. And in a television first we reveal the true effects of sex hormones on the brain by following 29yearold Max as, under the influence of monthly testosterone injections, she turns from a woman into a man.