Gay Sex DOES Make Babies

The Economist has an article with a new twist on efforts to understand the evolutionary implications of homosexuality. (I'm sure y'all don't need me to tell you that gay sex is not all that successful on the reproductive front.) A few years ago, there were some studies that demonstrated a link between male homosexuality and female fecundity. There was also a study that found that the more older brothers a man has, the more likely he is to be gay. As well as left-handedness being more likely among gay people. But this new study is saying this:

[Brendan Zietsch of the Queensland Institute of Medical Research in Brisbane, Australia, and his colleagues] think that genes which cause men to be more feminine in appearance, outlook and behaviour and those that make women more masculine in those attributes, confer reproductive advantages as long as they do not push the individual possessing them all the way to homosexuality.

There are also data which suggest that having a more feminine personality might indeed give a heterosexual male an advantage. Though women prefer traditionally macho men at the time in their menstrual cycles when they are most fertile, at other times they are more attracted to those with feminine traits such as tenderness, considerateness and kindness, as well as those with feminised faces.

. . . When the relationships between twins were included in the statistical analysis (all genes in common for identical twins; a 50%overlap for the non-identical) the team was able to show that both atypical gender identity and its influence on the number of people of the opposite sex an individual claimed to have seduced were under a significant amount of genetic control. More directly, the study showed that heterosexuals with a homosexual twin tend to have more sexual partners than heterosexuals with a heterosexual twin.

If a woman prefers a long-term relationship with a slightly feminized man and slightly masculinized women have more sex partners then what I am inferring from this little bit of information is that female mate choice is driving the existence of homosexuality. Wait, does that mean that our moms DID make us gay?!