- American Sociological Association: “The clear and consistent consensus in the social science profession is that across a wide range of indicators, children fare just as well when they are raised by same-sex parents when compared to children raised by opposite-sex parents.”
- The American Academy of Pediatrics wrote, "A considerable body of professional literature provides evidence that children with parents who are homosexual can have the same advantages and the same expectations for health, adjustment, and development as can children whose parents are heterosexual."
- Pennsylvania State University sociologist Paul Amato wrote, "If growing up with gay or lesbian parents were catastrophic for children, even studies based on small convenience samples would have shown this by now."
- Abbie E. Goldberg, a professor of psychology at Clark University, analyzed research from more than 100 academic studies in her book, Lesbian and Gay Parents and Their Children, which has the backing of the American Psychological Association. Goldberg found that children of same-sex parents do "just fine." The New York Times summarized Goldberg's findings: "In most ways, the accumulated research shows, children of same-sex parents are not markedly different from those of heterosexual parents. They show no increased incidence of psychiatric disorders, are just as popular at school and have just as many friends. ... [N]either sex is more likely to suffer from gender confusion nor to identify themselves as gay."
- Melanie L. Duncan, M.A. and Kristin E. Joos, Ph.D. of the University of Florida wrote in Sociologists for Women in Society (2011): "Extensive studies have been published looking at the fitness of LGBT individuals as parents and compare the children of
LGBT parent(s) with those of heterosexual parents indicate that there are no significant differences in terms of gender identity and sexual orientation."
- Sociologists Judith Stacey of New York University and Tim Biblarz of the University of Southern California conducted a review of nearly every study on gay parenting in 2010. They found that "Current claims that children need both a mother and father are spurious... At this point no research supports the widely held conviction that the gender of parents matters for child well-being."
- The U.S. National Longitudinal Lesbian Family Study found in 2012 that "[t]he absence of male role models did not adversely affect the psychological adjustment of 17-year-old teens raised in lesbian-headed households... The study is part of a growing body of research that evinces the positive psychological well-being of children reared in planned lesbian families."
- Henny Bos, Ph.D of the University of Amsterdam, the lead author of a June 2012 Gender & Society study, found "No differences were found in the well-being of those with and without male role models, or between girls and boys. There was no empirical evidence suggesting that boys require a same-sex parent, or male role model, to develop a healthy psychological well-being."
- Indiana University sociologist Brian Powell found in 2010 that the only potential harm to kids done by same-sex marriage is society's reaction. He said, "Imagine being a child living in a state with two parents in which, legally, only one parent is allowed to be their parent... In that situation, the family is not seen as authentic or real by others. That would be the disadvantage."