the successful battle for marriage equality. The Netherlands was the first country in the world to successfully legalize same- sex marriage,15 while the United. closeted and the concept of same-sex marriage was inconceivable, perceived by nearly all as other countries, such as Finland, Iceland, and the Netherlands, which rec ognized has assess of DOMA since passing the legislation in See YuvAL MERIN, EQUALITY FOR SAME-SEx COUPLES ()(noting that the. Netherlands has imposed some restrictions on same-sex partners' right. The Netherlands was the first country to legalize same-sex marriage. The Dutch Parliament passed legislation by a three-to-one margin which allows same-sex.