Fraternal Birth Disorder Defect.

The UK TIMES just brought to my attention in an article entitled “Are Eldest Children Really a Cut above?” the fact that the more male brothers a man has, the more likely that man is to be gay. Supposedly, this is a proven effect. Now I heard about the increased percentage of twins being gay (if one twin is gay, the higher the percentage that the other one is, too), but I’ve never come across this before. Suprisingly (or not), it only applies to men.