Stephen Sackur speaks to Welsh rugby legend, Gareth Thomas. He confronted one of the last great taboos in professional sport by publically revealing his homosexuality, while still playing at the top level. His honesty won him admiration within and far beyond the world of rugby, but has he changed anything for other gay sportsmen? And what other awkward truths lie behind the public mask donned by sport's elite performers?(Image: Gareth Thomas. Credit: Phil Cole/Getty Images)