NEW ProCon.org Website! – Should gay marriage be legal? – Gay marriage is allowed in ten countries, five US states, and the District of Columbia. 30 states have constitutional amendments banning gay marriage. Proponents argue that same-sex couples should have access to the same marriage benefits enjoyed by heterosexual couples. Opponents argue that altering the traditional definition of marriage as between a man and a woman will further weaken a threatened institution. ProCon.org’s 36th website explores the pros and cons of legalizing gay marriage.