Sexual revolution The second sexual revolution was a substantial change in sexual morality and sexual behaviour throughout the West in the s and early s. One associate memorably pegs it is as "being seduced by something one doesn't want to look at". Some Christians will tend to limit the circumstances and degree to which sexual pleasure is morally licit, for example to build self-control to prevent sex becoming addictive, or as a fast. There are, however, sufficient truly unexpected images throughout to keep one transfixed. Leda and the Swan  and several ancient authors purported to document it as a regular, accepted practice — albeit usually in "other" cultures. The Secrets of Love was written by a poet named Kukkoka. Premarital sex was not encouraged but was allowed in general, restrictions on adolescent sexuality were incest, exogamy regulations, and firstborn daughters of high-ranking lineage. This collection of explicit sexual writings, both spiritual and practical, covers most aspects of human courtship and sexual intercourse. Unsourced material may be challenged and removed. History of homosexuality Societal attitudes towards same-sex relationships have varied over time and place, from expecting all males to engage in same-sex relationships, to casual integration, through acceptance, to seeing the practice as a minor sin, repressing it through law enforcement and judicial mechanisms, and to proscribing it under penalty of death. Practically therefore the new age after Jesus now has marriage as only normative, but celibacy is a valuable gift in and of itself. Sexually transmitted diseases and Safe sex For much of human history, sexually transmitted diseases have been a scourge of humanity. Further effects of this disease run deep, radically impacting the expected average lifespan as reported by the BBC News: It was put together in this form by the sage Vatsyayana from a chapter manuscript that had itself been distilled from chapters that had in turn come from a compilation of some , chapters of text. It was frequent in ancient Greece; "unnatural" can be traced back to Plato. The Kamasutra is thought to have been written in its final form sometime between the third and fifth century AD.