actually you are mistaken.
here are a couple examples
same-sex marriages that have been documented around the world, including in more than 30 African cultures, such as the Kikuyu and Nuer.[17][19][20]
Various types of same-sex marriages have existed,[34] ranging from informal, unsanctioned relationships to highly ritualized unions.[35]
In the southern Chinese province of Fujian, through the Ming dynasty period, females would bind themselves in contracts to younger females in elaborate ceremonies.[36] Males also entered similar arrangements. This type of arrangement was also similar in ancient European history.[37]
The first recorded mention of the performance of same-sex marriages occurred during the early Roman Empire.[38] These same sex marriages were solemnized with the same ceremonies and customs which were used for heterosexual marriages.[39] Cicero mentions the marriage (using the latin verb for "to marry", i.e. nubere) of the son of Curio the Elder in a casual manner as if it was commonplace. Cicero states that the younger Curio was "united in a stable and permanent marriage" to Antonius.[40] Martial also mentions a number of gay marriages.[41] By Juvenal's time, gay marriages seem to have become commonplace as he mentions attending gay marriages as if there were "nothing special.".[42] These gay marriages continued until Christianity became the official religion of the Roman Empire. A law in the Theodosian Code (C. Th. 9.7.3) was issued in 342 AD by the Christian emperors Constantius II and Constans. This law prohibited same-sex marriage in ancient Rome and ordered that those who were so married were to be executed.[43][44]
[
edit] Modern
In October 1989, Denmark became the first nation to recognize same-sex unions in the form of "registered partnerships". In 2001, the Netherlands became the first nation to grant same-sex marriages.[45] Same-sex marriages are granted and mutually recognized by Belgium (2003),[46] Spain (2005), Canada (2005), South Africa (2006), Norway (2009), and Sweden (2009). In Nepal, their recognition has been judicially mandated but not yet legislated.[47]