I am probably seven or eight and my cousin, a couple of years older, has a Madonna calendar.

He effuses to me about her green eyes and "heart-shaped face" – an odd, adult phrase that he must have overheard somewhere. This moment sticks in my head because it is the first time I have heard a peer of mine express active desire for a grown-up, post-pubescent person. This represents a major step on from my current understanding of human sexual behaviour, which consists of the expectation that intermittently in life, if I am fortunate, a person I don't know will send an emissary across the playground to propose a liaison between us, which will then endure without the complication of direct contact, until one of us sees fit to call it off, by proxy of course.

Please enable cookies in your browser to display the rest of this article.