> I suspect there might not be "one gene" that makes a person a homosexual, but a collection of genes that increase the odds of someone being homosexual. One t

> I suspect there might not be "one gene" that makes a person a homosexual, but a collection of genes that increase the odds of someone being homosexual. One theory I've heard is that having lots of boys in the home, increases the likelihood that the next baby born will be gay (from Professor Adam Grant of the Give & Take fame). Somehow, all that testosterone in the home seeps through the womb and flips a switch on the unborn male baby.