Peccatum contra naturam

[Pecado contra la naturaleza] Source
La hipocresía cristiana y el sexo anal

Print, Paul Avril

Christianism

Historically in European countries it has often been referred to euphemistically as the peccatum contra naturam (the sin against nature, after Thomas Aquinas) or Sodomitica luxuria (sodomitical lusts, in one of Charlemagne's ordinances), or peccatum illud horribile, inter christianos non nominandum (that horrible sin that among Christians is not to be named). Christian religions disapprove of anal sex, although the degree of disapprobation varies greatly between denominations.
Ancient and non-Western cultures
The term "Greek love" has long been used to refer to the practice, and in modern times, "doing it the Greek way" is sometimes used as slang for anal sex. However, homosexual anal sex was far from a universally accepted practice in Ancient Greece. It was the target of jokes in surviving comedies; Aristophanes mockingly alludes to the practice, claiming that "Most citizens are europroktoi (wide-arsed) now."^[45] While pedagogic pederasty was an essential element in the education of male youths, these relationships, at least in Athens and Sparta, were expected to steer clear of penetrative sex of any kind. There are very few works of pottery or other art that display anal sex between older men and boys, let alone with adult men. Most such works depict fondling or intercrural sex, which was not condemned for violating and feminizing the boys. Other sources make it clear that the practice was criticized as shameful,^[46] and seen as a form of hubris.

Two Roman males in a lupanar; Warren Cup, British Museum

In later Roman age Greek poetry, anal sex became a common topos, represented as taking place with "eligible" youths: those who had attained the proper age but had not yet become adults. Seducing children into the practice was considered very shameful for the adult, and having such relations with a male who was no longer adolescent was considered more shameful for the young male than for the one mounting him.
Greek courtesans, or hetaerae, are said to have frequently practiced heterosexual anal intercourse as a means of preventing pregnancy.^[48] The acceptability of anal sex thus varied with the time-period and the location, as Ancient Greece spanned a long time and stretched over three continents and two major seas.
For a male citizen to take the passive (or receptive) role in anal intercourse was condemned in Rome as an act of impudicitia (immodesty or unchastity). Free men, however, frequently took the active role with a young slave, known as a catamite or puer delicatus. In fact the Romans thought of anal sex as something specifically "Greek," although Roman men often availed themselves of their own slaves or others in this way.^[49]

In Japan, records (including detailed shunga) show that at least some men in relationships with other men did engage in penetrative anal intercourse.

Man and woman having anal sex. Ceramic, Moche Culture. 300 C.E. Larco Museum Collection

Evidence suggestive of widespread heterosexual anal intercourse in a pre-modern culture can be found in the erotic vases, or stirrup-spout pots, made by the Moche people of Peru; in a survey^[50] of a collection of these pots, it was found that 31 percent of them depicted heterosexual anal intercourse, more by far than any other sex act. Moche pottery of this type belonged to the world of the dead, which was believed to be a reversal of life. Thus the reverse of common practices was often portrayed. The Larco Museum houses an Erotic Gallery in which this pottery is showcased. The 19th century anthropologist Richard Francis Burton has theorized that there is a geographical Sotadic zone wherein penetrative intercourse between men is particularly prevalent and accepted; moreover he was one of the first writers to advance the premise that such an orientation is biologically determined.