Some Muslims are fond of condemning western morality – alcoholism, nudity, premarital sex and homosexuality often being cited as examples. But Muslims do not have a monopoly on morality. In the west, child marriages and sex with children are illegal. Unfortunately, the same cannot be said for many Muslim countries.

I recently saw the documentary on the Dancing Boys of Afghanistan. It exposed an ancient custom called "bacha bazi" (boy for play), where rich men buy boys as young as 11 from impoverished families for sexual slavery. The boys are dressed in women's clothes and made to dance and sing at parties, before being carted away by the men for sex. Owning boys is considered a symbol of status and one former warlord boasted of having up to 3,000 boys over a 20-year period, even though he was married, with two sons. The involvement of the police and inaction of the government means this form of child prostitution is widespread.

The moral hypocrisy is outrageous in a country where homosexuality is not only strictly forbidden but savagely punished, even between two consenting adults. However, men who sodomise young boys are not considered homosexuals or paedophiles. The love of young boys is not a phenomenon restricted to Afghanistan; homosexual pederasty is common in neighbouring Pakistan, too. In my view, repression of sexuality and extreme gender apartheid is to blame.

And in the Middle East, it's young girls who are considered desirable and men are able to satisfy their lusts legally through child marriages. In Yemen, more than a quarter of girls are married before the age of 15. Cases of girls dying during childbirth are not unusual, and recently, one 12-year-old child bride even died from internal bleeding following sexual intercourse. In another case, a 12-year-old girl was married to an 80-year-old man in Saudi Arabia.

So why is the practice of child marriage sanctioned in Muslim countries? Unfortunately, ultra-conservative religious authorities justify this old tribal custom by citing the prophet Muhammad's marriage to Aisha. They allege Aisha was nine years old when the prophet married her. But they focus conveniently on selected Islamic texts to support their opinions, while ignoring vast number of other texts and historical information, which suggests Aisha was much older, putting her age of marriage at 19. Child marriage is against Islam as the Qur'an is clear that intellectual maturity is the basis for deciding age of marriage, and not puberty, as suggested by these clerics.