Mr John Barrowman is refreshingly gay. In a TV world where all gay men are either repressed or overt Mr Humphries types, it's bloody nice to see your archetypal gay man being... well... a modern gay. Of course, it must be irritating to be a person defined by your sexuality... but in this case, it's unavoidable as Barrowman went into a journey of his sexuality in John Barrowman: The Making of Me (BBC One, Thursday, 24 July, 9pm).

Now, the premise of the show was all about him and his nurture. Are gay people born that way or is it simply a choice? Of course, Barrowman had a lot at stake here. Should the scientist 'prove' that it's a choice, then boy, it could open up a decidedly dodgy can o'worms.

Let's not get ahead of ourselves though. John Barrowman, as I've said before, exhausts me. He's always performing. He cackles and belts out songs and is, for want of a lazy term, larger than life. That said, there's no question that he's a warm and likeable chap. The fact that he wears me out is my problem not his. More importantly, he's fiercely proud of his sexuality and that is something we should all applaud him for. He refutes the word 'marriage' as he doesn't want to buy into a process that, in essence, hates homosexuals. In this show, he made no bones about being gay and, even in these liberal and modern times, it was great to see him kissing his partner affectionately, like it's the most normal thing in the world. That's because it is the most normal thing in the world.

So, off John went with his gayness, to have various scientists do various tests on him. These tests were to determine whether he was born gay. Barrowman desperately wanted to prove that he was born gay because, if not, he could give credence to those idiotic naysayers who demand that being gay is a lifestyle choice or worse still, a perversion.

The tests veered from Barrowman having a panic attack in a brain scanning thingy to laughing his tits off at the thought of watching porn for science. When Barrowman laughs, it's almost impossible to keep a big stoopid grin off your face. These tests all pointed toward the fact that gay people are born gay. It's a genetic thing. Okay, it wasn't quite as clear cut as that, but that's the gist. Naturally, Barrowman (and the viewer I would hope) was delighted.

In amongst all the science, we got to see some of the 'nurture'. Going back to his parents (and most bizarrely, going back to a Scottish accent) we discovered that he liked Abba, playing with dolls, sporting a bikini in a talent show and all that stuff. However, Barrowman was determined to point out that these things didn't shape his penchant for blokes. The scientists pretty much backed him up, as did his family and friends.

In summary, this show could have been really quite heavy going, but thankfully, the producers picked someone easy on the eye whose enthusiasm and intelligence shone through like a beacon. If you missed it, I strongly advise you going to iPlayer and watching it as it's the most enjoyable thing I've watched on the box all week.