On July 16th, 2014 the European Court of Human Rights ruled that not extending the right to marry to same-sex couples does not violate the European Convention on Human Rights.
The petitioner to the court in this case was a man in Finland who had gone through a sex change and wanted to change his identity. He was told that if he was to do so, he would no longer be recognized as married to his wife: that marriage could be dissolved or transformed into a civil partnership.
The court explained that the European Convention “enshrines the traditional concept of marriage as being between a man and a woman.” Therefore it does not require acceptance of same-sex unions.The majority of the countries in the European Union maintain the true meaning of marriage as a bond between one man and one woman.
There’s an article about this ruling and its possible implications for American at Aleteia.