The answer to that question depends upon where you live. In many places in the world it has already been legalized, although in most places it has not. The rate at which new places legalize it seems to be accelerating, with 2013 being the top year so far.
The truth is that same-sex marriage is probably inevitable in all of North America, most of South America, and most of Europe and Oceania. There is almost no progress being made in Asia and Africa.
The legalization of same-sex marriage varies by country and region. It has been legalized in many countries around the world, with more countries continuing to recognize it. To know when same-sex marriage will be legalized in a specific location, it is best to refer to the latest legal developments and advocacy efforts in that particular area.
The first country to legalize same-sex marriage was the Netherlands in 2001.
If by "illegal" you mean "against the law," then none. There is no state in the US where same-sex marriage is considered a crime. In fact, in most US states, same-sex marriage is legally recognized. (See related questions below: "What US states have legalized same-sex marriage" and "What US states have banned same-sex marriage.")
The legalization of same-sex marriage in the United States was primarily due to the Supreme Court case Obergefell v. Hodges in 2015, which ruled that same-sex marriage is a constitutional right under the 14th Amendment. This decision effectively legalized same-sex marriage nationwide.
Yes, in many countries, same-sex marriage is legal, allowing lesbians to marry. However, laws vary by location so it's important to check the specific regulations in the relevant area.
Medical cannabis was legalized in the UK on November 1, 2018. However, recreational cannabis remains illegal in the UK.
Same-sex marriage has not been legalized in Laos.
No countries in the Balkans have legalized same-sex marriage.
No country in Central America has legalized same-sex marriage.
No former Soviet republics have legalized same-sex marriage.
No predominantly Muslim countries have legalized same-sex marriage.
Same-sex marriage was legalized in North Carolina on October 9, 2014.
Same-sex marriage was legalized in British Columbia on July 8, 2003.
Same-sex marriage was legalized in the Canadian province of Saskatchewan on November 5, 2004.
As of December 20, 2013, about 33% of US states have legalized same-sex marriage.
Same-sex marriage was legalized in the Canadian province of Nova Scotia on September 24, 2004.
Same-sex marriage was legalized in the Canadian province of Newfoundland and Labrador on December 21, 2004.
Same-sex marriage was legalized in the Canadian province of New Brunswick on June 23, 2005.