In June 2015, the U.S. Supreme Court ruled in Obergefell v. Hodges that every American has the constitutional right to marry the person they love. When reporting on marriage for same-sex couples, preferred terminology includes marriage equality and marriage for same-sex couples. Note, the terms gay marriage and same-sex marriage should be avoided, as they can suggest marriage for same-sex couples is somehow different than other marriages.
REFERENCE: GLAAD Media Reference Guide – 10th Edition