DavidV

"Twin and family research show that sexual orientation is 50% genetic, but it is unknown which genes are responsible. The other 50% derives from the development in the womb. Girls with higher testosterone levels in the womb have higher odds of being homosexual, and the chance of homosexuality with boys rises with the number of boys that came before them. Stress during pregnancy also increases the odds of homosexuality, through the influence of the mother's cortisol on the hormones of the chil...