The government's interest in protecting traditional families.  Numerous studies have shown that children do best when they are raised by two married, biological parents1. In the case of adopted children that is impossible, but a man and a woman is the best approximation of that family. Since that is the best environment to raise children, the government has to encourage and promote these traditional unions, not undermine them. Allowing gay couples to legally become parents, would legally and socially redefine what a family is and society as a whole may suffer. Children who are adopted already face bullying and exclusion in school because of their difference, placing them in same-sex households will double their exclusion and make their lives much harder than if placed in an opposite-sex household.  1 Council of Europe, The European Convention on Human Rights, 4th November 1950 ,( accessed 2nd August 2011)