Now Little bit of Wiki Knowledge :
Same-sex marriage, also known as gay marriage, is the marriage of two people of the same sex or gender, entered into in a civil or religious ceremony. There are records of same-sex marriage dating back to the first century. In the modern era, the first legislation legalizing same-sex marriage took effect in the Netherlands on 1 April 2001. Today, it is available in 29 countries.
As of 2021, same-sex marriage is legally performed and recognized in 29 countries (nationwide or in some jurisdictions) with the most recent being Costa Rica (2020). Switzerland held a referendum on 26 September 2021 that returned a 64% yes-vote, which will allow same-sex couples to marry starting 1 July 2022.