'Actually, they couldn't have been better about it. They had a pretty good idea that I was gay, of course. Parents so often do. But I do remember my dad saying to me at the time, "Your mother and I don't discuss what happens in the bedroom with you, so why should you with us?"'
Most touchingly, his parents - deeply Christian churchgoers - publicly defended him against their gay-hating friends, even choosing to leave their church because of its inherently homophobic approach.
'My mother stood up in church once when someone said that all gays should be put on an island and left there. "How dare you," she said. "That is my son you are talking about." My parents walked out. They lost friends. I admire them so much for taking that stand. I never had a problem with being gay, but their acceptance made it so much easier.'
He is incredibly close to his parents, to a level that most people won't admit to. 'I was staying in a hotel with them just recently, and I wandered through to their room to have a chat and got into bed beside them.
I'm not ashamed to admit that. My mum thinks you are never too old for a cuddle. My dad is the same. If I was sitting with him now, I'd have my shoes off and my feet in his lap. I like that I can be like this with them. There's no pretence there.'
He has been with his partner, architect Scott Gill, for 13 years, and seems to have applied the same 'work-bloody-hard-at-it' mentality to his relationship.
Two years ago, they became civil partners. He still refuses to use the term 'marriage', because 'that has religious connotations, and why should we want to be associated with a religious institution that hates us?'
John is clearly in an impossible situation when it comes to his sexuality. He would like it to not be an issue. He says, 'I'm an actor. Not a gay actor. Is Brad Pitt ever described as a "straight actor"?'
But he acknowledges that some do see him as a role model, particularly because of Captain Jack's persona - bisexual, or 'omni-sexual' as he prefers to describe him, but belonging to an age where sexual orientation is no longer even classified.
Still, he can't help railing against the homophobia in the showbiz world - still as rampant as it is in his parents' church, he believes, only much more insidious.
He was famously rejected for the role of Will in Will & Grace, on the grounds that he was 'too straight'. He rolls his eyes. 'Because I like sports and I like cars, I'm not easy to slot into that "camp" box. To me, it is just pigeonholing. Too easy.'
He believes that the Will & Grace model is a perfect example of what is wrong with the way the big American networks portray 'gayness'.
'If that programme was true to life, Will would have a boyfriend. But they want to perpetrate the myth that he is waiting to be "cured".
'I hate that. I've never wanted to be "cured". There is nothing wrong with me. I am walking proof of how a man can be gay and still have a loving partner, a great home, dogs, a happy family, all that stuff.'
He's getting perilously close to 'family values' here, I tease. He laughs. 'No, no. I'm far too naughty for that.'
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If you're not familiar with John who is famous for his role in Torchwood, (or even if you are) I'd highly recommend his series, "The Making of Me":
The Making of Me (6 Parts)
Part 1: http://www.youtube.com/watch?v=m27Awmlgi38
Part 2: (DEAD) http://www.youtube.com/results?search_q ... f+Me+2%2F6
Part 3: http://youtu.be/YTluaVblioQ
Part 4: http://youtu.be/ND-YWHueaFU
Part 5: (DEAD) http://www.youtube.com/results?search_q ... f+Me+5%2F6
Part 6: http://youtu.be/pfLcmSp3p8Q
Barrowman seeks to answer the question: why am I the way I am? In this one-hour special, Barrowman sets out to unearth what the latest scientific research can tell him about the origins of his homosexuality.
His search for evidence takes him back to his roots to meet family and old friends. He also meets with psychologists and geneticists, compares his DNA to his heterosexual brother's, and conquers his claustrophobia to undergo a brain scan - all in the quest to find out how nature and nurture might have interacted to make him who he is.
Barrowman tells the BBC: "My sexuality has never been deliberately hidden. I'm in a committed relationship with the love of my life, Scott Gill, and he is as much a part of the family as my sister's husband, Kevin, and my brother's wife, Dot. However, just because I'm comfortable with my sexuality doesn't mean that I'm not curious about it and that's one of the reasons I agreed to take this journey to discover the making of me."