The Debating Europe released an infographic on arguments for and against gay marriages. As of 2017, 17 of the 26 countries worldwide allows gay marriage and it was mostly in western Europe. so far no countries in Central and Eastern Europe have legalized gay marriage. The Netherlands is the first country in the world to legalize same-sex marriage.
In 2018, The European Court of Justice(ECJ) ruled that EU member states should recognize gay marriages contracted in fellow EU states and grant couples the same residency rights that other families enjoy. countries legally recognize and perform same-sex marriage are Belgium, Denmark, Finland, France, Germany, Iceland, Ireland, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, and the United Kingdom.
The average percentage of support for same-sex marriage in the European Union as of 2006 when it had 25 members was 44%, which had descended from a previous percentage of 53%. The change was caused by more socially conservative nations joining the EU. In 2015, with 28 members, average support was at 61%.
Image credits: Courtesy of Debating Europe