The gay marriage , commonly called same sex marriage , means the marriage of same sexIt offers couples of same sex couples homosexuals , the right to unite in the same way as couples of different sexes. It may designate an extension of the concept of marriage or some form of union endowed with its own regime.

If marriage between same sex are in some ethnic groups , most companies do not provide this possibility. However at the beginning of xxi th  century, an evolution of several laws has led, in ten states, the legal recognition of civil unions or marriages between persons of the same sex. The political debate taking place about gay marriage raises related issues, especially concerning the rights of unmarried couples or same-sex married vis-à-vis the descent and the adoption .

French dictionaries offer a variety of definitions of marriage, which can exclude or include the marriage of same sex. For example, the Treasury of the French language (TLF), published 1971 to 1994 , indicates that marriage is the “union between a man and a woman consecrated by a set of civil acts or sometimes religious”Conversely, Webster , in his edition of 2011 , refers to marriage as the “lawful union of two persons as provided by law” , and mentions in his examples the “gay marriage” .

At 11 February 2012 , ten countries have legalized gay marriage: the Netherlands (2000), Belgium (2003), the Spanish (2005), Canada (2005), the South Africa (2006), the Norway (2008), Sweden (2009), Portugal (2010), the Iceland (2010) and Argentina(2010), with an additional seven states of the United States ( Massachusetts , Connecticut , Iowa , New Hampshire , Washington , Vermont , New York ), and the city of Washington, DC . In Mexico, gay marriage was legalized by the City of Mexico , and is also authorized by the State of Quintana Roo.