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Thank you for that link.

The paper cited is "Childhood Family Correlates of Heterosexual and Homosexual Marriages". It's available online, but only for purchase. However the abstract is available at http://www.springerlink.com/content/al4574p6203628w0/

Abstract: "Children who experience parental divorce are less likely to marry heterosexually than those growing up in intact families; however, little is known about other childhood factors affecting marital choices. We studied childhood correlates of first marriages (heterosexual since 1970, homosexual since 1989) in a national cohort of 2 million 18–49 year-old Danes. In multivariate analyses, persons born in the capital area were significantly less likely to marry heterosexually, but more likely to marry homosexually, than their rural-born peers. Heterosexual marriage was significantly linked to having young parents, small age differences between parents, stable parental relationships, large sibships, and late birth order. For men, homosexual marriage was associated with having older mothers, divorced parents, absent fathers, and being the youngest child. For women, maternal death during adolescence and being the only or youngest child or the only girl in the family increased the likelihood of homosexual marriage. Our study provides population-based, prospective evidence that childhood family experiences are important determinants of heterosexual and homosexual marriage decisions in adulthood."

All very interesting.

But I don't see any mention of homosexuality as "learned behavior". What does having older parents or being one of the last born children have to do with "learned behavior."

In particular, there is NO mention of ANY correlation between having gay or lesbian parents and marrying a person of the same sex.

In fact, based on the research you provided, the first child born to young gay parents is more likely to be heterosexual than the second child born to older straight parents.