A new peer-reviewed study about gay parents raising gay kids in AOL News.

Excerpt:

Walter Schumm knows what he’s about to do is unpopular: publish a study arguing that gay parents are more likely to raise gay children than straight parents. But the Kansas State University family studies professor has a detailed analysis that past almost aggressively ideological researchers never had.

[…]His study on sexual orientation, out next month, says that gay and lesbian parents are far more likely to have children who become gay. “I’m trying to prove that it’s not 100 percent genetic,” Schumm tells AOL News.

His study is a meta-analysis of existing work. First, Schumm extrapolated data from 10 books on gay parenting… [and] skewed his data so that only self-identified gay and lesbian children would be labeled as such.

This is important because sometimes Schumm would come across a passage of children of gay parents who said they were “adamant about not declaring their sexual orientation at all.” These people would be labeled straight, even though the passage’s implication was that they were gay.

Schumm concluded that children of lesbian parents identified themselves as gay 31 percent of the time; children of gay men had gay children 19 percent of the time, and children of a lesbian mother and gay father had at least one gay child 25 percent of the time.

Furthermore, when the study restricted the results so that they included only children in their 20s — presumably after they’d been able to work out any adolescent confusion or experimentation — 58 percent of the children of lesbians called themselves gay, and 33 percent of the children of gay men called themselves gay. (About 5 to 10 percent of the children of straight parents call themselves gay, Schumm says.)

Schumm next went macro, poring over an anthropological study of various cultures’ acceptance of homosexuality. He found that when communities welcome gays and lesbians, “89 percent feature higher rates of homosexual behavior.”

Finally, Schumm looked at the existing academic studies… In all there are 26 such studies. Schumm ran the numbers from them and concluded that, surprisingly, 20 percent of the kids of gay parents were gay themselves. When children only 17 or older were included in the analysis, 28 percent were gay.

Here’s the paper entitled “Children of homosexuals more apt to be homosexuals?“. It appeared in the Journal of Biosocial Science.

Abstract:

Ten narrative studies involving family histories of 262 children of gay fathers and lesbian mothers were evaluated statistically in response to Morrison’s (2007) concerns about Cameron’s (2006) research that had involved three narrative studies. Despite numerous attempts to bias the results in favour of the null hypothesis and allowing for up to 20 (of 63, 32%) coding errors, Cameron’s (2006) hypothesis that gay and lesbian parents would be more likely to have gay, lesbian, bisexual or unsure (of sexual orientation) sons and daughters was confirmed. Percentages of children of gay and lesbian parents who adopted non-heterosexual identities ranged between 16% and 57%, with odds ratios of 1.7 to 12.1, depending on the mix of child and parent genders. Daughters of lesbian mothers were most likely (33% to 57%; odds ratios from 4.5 to 12.1) to report non-heterosexual identities. Data from ethnographic sources and from previous studies on gay and lesbian parenting were re-examined and found to support the hypothesis that social and parental influences may influence the expression of non-heterosexual identities and/or behaviour. Thus, evidence is presented from three different sources, contrary to most previous scientific opinion, even most previous scientific consensus, that suggests intergenerational transfer of sexual orientation can occur at statistically significant and substantial rates, especially for female parents or female children. In some analyses for sons, intergenerational transfer was not significant. Further research is needed with respect to pathways by which intergenerational transfer of sexual orientation may occur. The results confirm an evolving tendency among scholars to cite the possibility of some degree of intergenerational crossover of sexual orientation.

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