I don't know but for some reason I have heard of this explanation before I think it was in a psychology class that I took a couple of years back. At any rate I remember the correlation of gay boys to the number of older brothers being fairly strong. If it is the womb that causes Homosexuality then there should be a cure for it. Maybe the solution is to put the mother on a dose of steroids after the first son and up the dose for each additional son if the cause truly is the mother’s ability to compensate for her male babies hormones.
the cure would be small families; oops that's already happening; shufflin' down the path to extinction?