Jews are instructed to ritually cleanse themselves after having been in contact with a Torah scroll - or a corpse. This association of the sacred with the accursed and the holy with the depraved is the key to the guilt and sense of danger which accompany the violation of a taboo. In Polynesia, where the term originated, "taboos could include prohibitions on fishing or picking fruit at certain seasons; food taboos that restrict the diet of pregnant women; prohibitions on talking to or touching chiefs or members of other high social classes; taboos on walking or traveling in certain areas, such as forests; and various taboos that function during important life events such as birth, marriage, and death." Political correctness is a particularly pernicious kind of taboo enforcement. It entails an all-pervasive self-censorship coupled with social sanctions. Consider the treatment of the right to life, incest, suicide, and race. II. Incest In contemporary thought, incest is invariably associated with child abuse and its horrific, long-lasting, and often irreversible consequences. But incest is far from being the clear-cut or monolithic issue that millennia of taboo imply. Incest with minors is a private - and particularly egregious - case of pedophilia or statutory rape. It should be dealt with forcefully. But incest covers much more besides these criminal acts. Incest is the ethical and legal prohibition to have sex with a related person or to marry him or her - even if the people involved are consenting and fully informed adults. Contrary to popular mythology, banning incest has little to do with the fear of genetic diseases. Even genetically unrelated parties (a stepfather and a stepdaughter) can commit incest. Incest is also forbidden between fictive kin or classificatory kin (that belong to the same matriline or patriline). In certain societies (certain Native American tribes, or the Chinese) it is sufficient to carry the same family name (i.e., to belong to the same clan) to render a relationship incestuous. Clearly, eugenic considerations have little to do with incest. Moreover, the use of contraceptives means that incest does not need to result in pregnancy and the transmission of genetic material. Inbreeding (endogamous) or straightforward incest is the norm in many life forms, even among primates (e.g., chimpanzees). It was also quite common until recently in certain human societies - the Hindus, for instance, or many Native American tribes, and royal families everywhere. Nor is the taboo universal. In some societies, incest is mandatory or prohibited, according to one's social class (Bali). In others, the Royal House started a tradition of incestuous marriages, later emulated by the lower classes (Ancient Egypt). The list is long and it serves to demonstrate the diversity of attitudes towards this most universal practice.