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.
Family/social life = environmental factors = learned behavior. BTW, you left off the biggest correlation, coming from a broken home.
In particular, there is NO mention of ANY correlation between having gay or lesbian parents and marrying a person of the same sex.
The study looked at marriages from 1989. If that is when marriage was made legal for homosexuals in Denmark, their children are too young to be married.
Here's some more cause and effect for you:
From Tammy Bruce, The Death of Right and Wrong, p99
Almost without exception, they gay men I know (and that's too many to count) have a story of some kind of sexual trauma or abuse in their childhood - molestation by a parent or an authority figure, or seduction as an adolescent at the hands of an adult.
From Born or Bred? Science Does Not Support the Claim That Homosexuality Is Genetic
Post reporter Laura Sessions Stepp writes:
Recent studies among women suggest that female homosexuality may be grounded more in social interaction, may present itself as an emotional attraction in addition to or in place of a physical one, and may change over time.11She cites one such study by Lisa M. Diamond, assistant professor of psychology and gender studies at the University of Utah, who in 1994 began studying a group of females aged 16 to 23 who were attracted to other females.12 Over the course of the study, "almost two-thirds have changed labels," Stepp reports.