Are we born straight or gay? TORCHWOOD's Capt. Jack investigates

Torchwood's Captain Jack is a new kind of sci-fi hero, a swashbuckling, omnisexual adventurer who divides his time between foiling alien invasions and bedding anything with two legs (and I'm not so sure that two is his maximum.) But Torchwood star John Barrowman is gay himself, and while Jack Harkness grew up in a culture where bisexuality is the norm, Barrowman struggled with his own sexuality growing up.

In this clip from the BBC science show The Making of Me, Barrowman investigates the nature of his own sexuality and learns some interesting things about human sexuality in general.

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