As Luxembourg becomes the latest country to adopt marriage rights for same-sex couples, we look at the countries which have done the same.
Marriage momentum crossed borders in 2014, bringing marriage equality to more parts of the world than ever before.
In France, where same-sex couples began marrying legally in May 2013, 13 percent of all marriages in Paris in 2014 were same-sex marriages.
Same-sex couples in England and Wales began marrying on March 29, 2014 and marriage equality arrived in Scotland at the end of last month. In November, the government of Finland passed marriage equality legislation.
2015 is also expected to be a big year for marriage equality worldwide. On January 1, Luxembourg joined the list.
In facts its PM, Xavier Bettel, might not be far behind the first couples tying the knot after his partner Gauthier Destenay proposed in August.
Mr Bettel said: “He asked me, and I said yes.”
The Republic of Ireland will hold a referendum on same-sex marriage in May. In December, a same-sex marriage bill was introduced in Chile.
In Taiwan, it is possible that a same-sex marriage amendment will be voted on later in 2015. If it passes, Taiwan would be the first East Asian country to pass marriage equality.
There are now 20 countries with nationwide marriage equality.
In 2014, 19 states in America won marriage, compared to eight in 2013.
New Zealand, but not Australia, has issued licenses.