How Older Brothers Influence Homosexuality
Homosexuality might be partly driven by a mother’s immune response to her male fetus—which increases with each son she has.
Here’s what we know: Homosexuality is normal. Between 2 and 11 percent of human adults report experiencing some homosexual feelings, though the figure varies widely depending on the survey.
Homosexuality exists across cultures and even throughout the animal kingdom, as the authors of a mammoth new on homosexuality write. Between 6 and 10 percent of rams prefer to mount other rams, not ewes. Certain groups of female Japanese
