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 empathetic - 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 29-year-old Max as, under the influence of monthly testosterone injections, she turns from a woman into a man.
Everyone knows that men and women are not the same but, apart from the obvious physical differences, what exactly does it mean, and how does it affect people in their day-to-day approach to living and loving? This new BBC documentary series examines the latest scientific theories on what makes the genders distinct from each other and how that influences everything from how people communicate to their approach to dating and mating.