The sexual revolution of post-World War II America changed sexual and gender roles profoundly.
With reports from hundreds of sub-Saharan African locales of male-male sexual relations and from about fifty of female-female sexual relations, it is clear that same-sex sexual relations existed in traditional African societies, though varying in forms and in the degree of public acceptance
In British law, Section 28 of the Local Government Act, enforced from 1988 until 2003, prohibited the promotion of homosexuality and teaching the acceptability of homosexuality as a "pretended family relationship".
The Hijras--men who dress and act like women--have been a presence in India for generations, maintaining a third-gender role that has become institutionalized through tradition.
The dominant ideology among politicized lesbians during the 1970s and 1980s, Lesbian Feminism was based on the premise that lesbianism and feminism were inextricably linked.
Harvey Milk, among the first openly gay man to be elected to public office in the United States, was assassinated in San Francisco's City Hall, making him the American gay liberation movement's most visible martyr.
By the early twentieth-century, YMCAs had become popular havens for men who sought sex with other men.
Compulsory heterosexuality is the assumption that women and men are innately attracted to each other emotionally and sexually and that heterosexuality is universal, a view that leads to an institutional inequality of power that privileges heterosexual males and denigrates women, especially lesbians.
Ed Miliband, leader of the U.K.'s Labour Party, has added his support to the Out4Marriage campaign. In a video made to support marriage equality in Britain, Miliband said that his party believes that churches should be allowed to hold same-sex weddings, a provision which is not in the marriage equality legislation proposed by the Conservative government of Prime Minister David Cameron.
As Scott Roberts reports in PinkNews, "The Out4Marriage video is Mr Miliband's first major public comment on the issue of same-sex marriage since the 2010 Labour leadership election when he pledged his support for the issue. . . ."
Then Miliband said, "I want to see heterosexual and same-sex partnerships put on an equal basis and a Labour Party that I lead will campaign to make gay marriage happen."
According to Helene Mulholland of the Guardian, sources in the Labour Party have said that it is highly likely the party will "whip" its MPs to back marriage equality legislation, in contrast with Prime Minister Cameron, who has promised Conservative Party MPs a free or "conscience" vote because of divisions within the party.
Liberal Democrat MPs are also expected to be whipped to vote in favor of the marriage equality bill.
Miliband has been Leader of the Opposition since September 2010, when he was elected leader of the Labour Party, defeating among others his brother David, with whom he served in the cabinet of former Prime Minister Gordon Brown.
Here is his Out4Marriage video.