A Conservative MP has claimed "most parents" don't want their children to be gay. How can he possibly know? How many has he asked? Certainly not me; if he had, I'd have told him I like having a gay son so much I think everyone should have one.

David Davies's presumption that he knows what I feel about my child is startling. Here's what I feel about my son: I love him. I respect and admire him and think he's one of the funniest people I know. I regard his sexuality as about as important as being left-handed: it's a bit different, it affects his life, it's moderately interesting; but it's a very long way from defining him.

I'm not saying having a gay son is better than having a straight one – I've got a couple of those and very nice they are too – but I refuse to accept Mr Davies's proposition that it's worse. I can't see any of my children as lesser than the others. Parents value their children for all sorts of qualities – quite often, on a day-to-day basis, to do with how much washing up they do – and their sexuality is rarely the most pressing.

Davies's assertion was meant as a contribution to the marriage debate, although it's hard to see how he thought it was relevant because gay marriage doesn't produce gay children. It's heterosexual marriage that does that. If you don't want gay children, that's the one you should get rid of.

On the wild generalisation front, I think I can say with rather more authority than Davies that "most parents" want their children to be happy and have opportunities to take their place in the world. I happen to be a fan of marriage. My son may turn out to see marriage as unnecessary or unhelpful, but I don't see why he shouldn't be able to make the same choice about that as his siblings. And I like having a gay child so much that personally, I'd welcome another one. I'd be thrilled to get a gay son-in-law. Preferably one who'd remind my son to ring his mother a bit more often.

Davies's rather incoherent objection to gay marriage also asserts that it would affect sex education (why?). Though if it did, that would be a very good thing, parent-of-gay-child-wise. If a substantial minority are strongly attracted to their own sex, why do we insist on implying in school that it's unnatural? No wonder they get bullied. And I'm sure my younger straight children have benefited from understanding that sexuality is complex.

Having a gay son has been highly amusing, has made me angry (with other people, not with him) and has given me and the rest of the family a slightly different and often enlightening perspective on the world. Who knows how many of my lovely son's qualities are to do with being gay? Who cares? I am quite strict with the kids about avoiding stereotypes – we're not in the business of constraining anyone with cliches – but the slightly awkward truth is that my gay son can dance better than the rest of us put together. That's about the most meaningful difference, I reckon. It's also very nice to watch.