 In the 20th century sexual roles were redefined once again. For a variety of reasons, premarital intercourse slowly became more common and eventually acceptable. With the decline of prohibitions against sex for the sake of pleasure even outside of marriage, it became more difficult to argue against gay sex. These trends were especially strong in the 1960s, and it was in this context that the gay liberation movement took off. Although gay and lesbian rights groups had been around for decades, the low-key approach of the Mattachine Society (named after a medieval secret society) and the Daughters of Bilitis had not gained much ground. This changed in the early morning hours of June 28, 1969, when the patrons of the Stonewall Inn, a gay bar in Greenwich Village, rioted after a police raid. In the aftermath of that event, gay and lesbian groups began to organize around the country. Gay Democratic clubs were created in every major city, and one fourth of all college campuses had gay and lesbian groups (Shilts, 1993, ch.28). Large gay urban communities in cities from coast to coast became the norm. The American Psychiatric Association removed homosexuality from its official listing of mental disorders. The increased visibility of gays and lesbians has become a permanent feature of American life despite the two critical setbacks of the AIDS epidemic and an anti-gay backlash (see Berman, 1993, for a good survey). The post-Stonewall era has also seen marked changes in Western Europe, where the repeal of anti-sodomy laws and legal equality for gays and lesbians has become common. In the 21st century, the legal recognition of same-sex marriage has become widespread.