The sexual revolution, also known as the sexual liberation, was a social movement that challenged traditional codes of behavior related to sexuality and interpersonal relationships throughout the Western world from the 1960s to the 1970s. Sexual liberation included increased acceptance of sex outside of traditional heterosexual, monogamous relationships (primarily marriage). The normalization of contraception and the pill, public nudity, pornography, premarital sex, homosexuality, masturbation, alternative forms of sexuality, and the legalization of abortion all followed. Origins First sexual revolution Several other periods in Western culture have been called the "first sexual revolution", to which the 1960s revolution would be the second (or later). The term "sexual revolution" itself has been used since at least the late 1920s. The term appeared as early as 1929; the book Is Sex Necessary? Or, Why You Feel the Way You Do by James Thurber and E. B. White, has a chapter titled "The Sexual Revolution: Being a Rather Complete Survey of the Entire Sexual Scene". According to Konstantin Dushenko, the term was in use in Soviet Russia in 1925. When speaking of the sexual revolution, historians make a distinction between the first and the second sexual revolution. In the first sexual revolution (1870–1910), Victorian morality lost its universal appeal. However, it did not lead to the rise of a "permissive society". Exemplary for this period is the rise and differentiation in forms of regulating sexuality. Classics professor Kyle Harper uses the phrase "first sexual revolution" to refer to the displacement of the norms of sexuality in Ancient Rome with those of Christianity as it was adopted throughout the Roman Empire. Romans accepted and legalized prostitution, bisexuality, and pederasty. Male promiscuity was considered normal and healthy as long as masculinity was maintained, associated with being the penetrating partner. In contrast, female chastity was required for respectable women, to ensure the integrity of family bloodlines. These attitudes were replaced by Christian prohibitions on homosexual acts and any sex outside marriage (including with slaves and prostitutes). History professor Faramerz Dabhoiwala cites the Age of Enlightenment—approximately the 18th century—as a major period of transition in the United Kingdom. During this time, the philosophy of liberalism developed and was popularized, and migration to cities increased opportunities for sex and made enforcement of rules more difficult than in small villages. Sexual misconduct in the Catholic Church undermined the credibility of religious authorities, and the rise of urban police forces helped