Same-sex marriage is when homosexual couple (man and man/women and women) get married through a legal binding of marriage just as any other heterosexual couple would. It is currently legal to perform same-sex marriage in 28 countries and is recognised in 2 additional countries. In the United States, the equal right to marry for homosexual couples was granted to them through equal protection in the 14th amendment. The institution of marriage has existed for since approximately 1250 CE and is generally defined by the individual's perspective on civil rights, religion, and expression of love.Over the course of years, the definition and standards of marriage have evolved. Click on the buttons below to learn more about each concept of marriage: