Human sexual behaviour can be perilous, as the ghastly rape of a 23-year-old woman by six men on a Delhi bus in December once again showed. After going to the cinema, she and her boyfriend were beaten, before she was brutally assaulted and attacked with an iron rod for more than an hour. Thirteen days later, she died from her wounds.It is often claimed that rape is not really about sex, but about power. True enough. But it is not unrelated to sex. The sexual act is used as a form of torture, or even, in some cases, as a deadly weapon.But that was not what Pope Benedict XVI had in mind when he spoke in his pre-Christmas speech to the Roman Curia.It was a deeply confused speech. His disquisition on the dangers posed by same-sex marriage followed a passage deploring the modern tendency to avoid lifelong commitments in human relationships, as if that were not precisely what gay marriage is about. Of course, in the pope’s view, commitment in gay relationships is part of the problem: more and more people, especially in the Western world, now claim the freedom to choose their own sexual identities instead of sticking to the "natural” roles "ordained by God.”The pope’s words suggest that homosexuality is a kind of lifestyle choice, a form of modern decadence – a secular, even blasphemous act against God and nature – rather than a fact of birth. Fear of sexual behavior is one of the main reasons why most religions establish strict rules concerning sexual relationships. Marriage is a way to contain our dangerous desires. Restricting sexual conduct to procreation is supposed to make the world safer and more peaceful. Benedict is not so extreme. Nor does he advocate violence against homosexuals. On the contrary, he sees himself as a deeply civilised man of peace. But I would argue that his speech actually encourages the kind of sexual aggression that can result in the savagery that took place in Delhi recently.The six rapists who killed the young woman were not modern decadents who chose to defy God and nature by claiming new secular freedoms, let alone heterodox sexual identities. From what we can surmise from this case – and many others like it – they are the semi-urbanised products of a highly conventional rural society where the roles of men, and especially women, are tightly regulated. Their victim, a well-educated physiotherapy intern, seems to have been a great deal more modern than her attackers. The men were not uneducated, but they were unable to cope with the freedoms of contemporary women.For that reason, the six rapists saw her as a "loose” woman, a city slut, fair game. After all, she was out late with her boyfriend. That is precisely how the men taunted the young couple: What was an unmarried young woman doing out in the Delhi streets with a young man? She deserved what was coming to her.Violent hatred of homosexuals comes from a similar source. Just as women outside the family home – women who stake a claim to public space, working and living among men – are seen as dangerous temptresses, men who love men are often regarded as predators, ready to pounce on society’s children. What many people fear is not just uncontrolled sexual behavior, but sex itself.But the more sex is repressed and people are made to fear it the greater the chance of sexual violence, because anyone who might possibly stir our sexual desires, man or woman, becomes a potential target of our rage.This might help to explain what happened in Delhi, but it does not in any way excuse it. One wishes that the pope had said something about that, and had offered some words of encouragement to the men and women in India who have had enough of sexual violence coming not from modern libertines, but from deeply repressed men. But that is too much to expect from a man who appears to understand little about sexual life. That is why, instead of talking about rapists, he targeted peaceful homosexual men and women who wish to show their commitment to their lovers by marrying them.Ian Buruma is Professor of Democracy, Human Rights, and Journalism at Bard College.