Buddhist monks follow a lot of rules – 253 in one tradition, 200 in another. As the story goes, all of these rules were made by the Buddha himself. However, he did not announce them all at once, like Moses descending from Mount Sinai with the Ten Commandments. Instead, they’re said to have evolved organically, with the Buddha making a rule only after he judged a particular deed to be a misdeed. The first of the rules to be established was not against murder; it was against sex.
The inciting incident was when a man named Sudinna left his wife and parents to become a monk. Some time later, he came home and made love to his wife – not for love or lust, but at the urging of his mother. She worried that if she and her husband died without an heir, the king would seize their property. Although there was no rule against monks having sex at the time, Sudinna felt guilty and told some other monks what had happened. Those monks tattled to the Buddha, who summoned Sudinna for perhaps the worst scolding in Buddhist literature:
Worthless man, it would be better that your penis be stuck into the mouth of a poisonous snake than into a woman's vagina. It would be better that your penis be stuck into the mouth of a black viper than into a woman's vagina. It would be better that your penis be stuck into a pit of burning embers, blazing and glowing, than into a woman's vagina. Why is that? For that reason you would undergo death or death-like suffering, but you would not on that account, at the breakup of the body, after death, fall into deprivation, the bad destination, the abyss, hell.
Over the long history of Buddhism , most of its vast literature has been composed by celibate monks. Sexual intercourse – defined as the penetration of an orifice even to the depth of a sesame seed – was the first transgression to entail permanent expulsion from the monastic order. Monks have written works of particular misogyny, such as the ‘Blood Bowl Sutra’ where the blood is menstrual blood. They have also sought to control the sex lives of Buddhist lay people by imposing a wide range of restrictions, such as prohibiting sex during the day or the penetration of any orifice other than the vagina. These rules have remained in place, cited in modern discussions of Buddhist attitudes toward gay and lesbian sex. Buddhist texts across Asia have presented monks as models of chastity. However, their depiction in the plays and novels of various Buddhist countries can be quite different – like in medieval Europe, monks were often portrayed as lechers.
An important counter-narrative about sex came with the rise of what is called tantra, a movement that began in India about a millennium after the Buddha's death. While sex had long been seen as pollution, here it was transformed into a path to purity. Tantric texts made elaborate arguments about the sublime states of bliss available through orgasm, and set forth secret techniques that resulted in deep states of bodily bliss. Some would claim that sex was not only permissible but necessary – that all buddhas of the past had attained enlightenment and buddhahood through tantric sex.
Still, it wasn't until the 20th century that we find a sustained critique of monastic norms and advocacy of sexual pleasure in Buddhist literature outside the tantric milieu. In 1939, the Tibetan writer (and former monk) Gendun Chopel composed a work that he simply called A Treatise on Passion. Written entirely in verse, it is one of only two works of erotica in the vast literature of Tibetan Buddhism.