Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Jan 10, 2012
More about this programme: http://www.bbc.co.uk/programmes/b019lt17 Peter talking about his sex life and how his mood changes if he doesn't have sex for too long a period, also looking into the science behind testosterone levels using CGI Graphics. Finally we see Peter talking to girls on a night out.