Research has shown that marriage provides substantial psychological and physical health benefits due to the moral, economic and social support extended to married couples. Conversely, recent empirical evidence has illustrated the harmful psychological effect of policies restricting marriage rights for same-sex couples. Additionally, children raised by same-sex couples have been shown to be on par with the children of opposite-sex couples in their psychological adjustment, cognitive abilities and social functioning.
The American Psychological Association. Aug. 11, 2010 press release “American Psychological Association Reiterates Support for Same-sex Marriage”