According to http://gaymarriage.procon.org, 25 states banned same sex marriage after the enactment of the Defense of Marriage Act (DOMA). As of the posting of this article, 15 states allow for gay marriage, compared to the 35 states have banned gay marriage. Oddly enough, there is still new mexico, who has not taken either action. Massachusetts (May 17, 2004) was the first state to allow for gay marriage. Way to go Massachusetts.