Some researchers say this is partly because women who have sex with women tend to be more fluid in their sexual orientation. In a preliminary conference report, the researchers suggested that the variants are associated with heterosexuals having more sexual partners than usual, and that heterosexual men with some of the variants are more attractive than those without. Horm Behav. The previous research also indicated that grave disease had been seen more in gay men than in straight men. Biological theories for explaining the causes of sexual orientation are favored by scientists  and involve a complex interplay of genetic factors, the early uterine environment and brain structure. The fact that TSHR seems to be involved in sexual orientation fits with evidence that thyroid function seems to be linked to sexuality. Personality and Social Psychology Bulletin.
One, a cluster of DNA on chromosome 15, has previously been found to predict male-pattern baldness.
November Limiting global warming to 1. European Journal of Epidemiology.
Gene finding efforts have issues, as Copland argues, but these are technical and not catastrophic errors in the science.