Study: Homosexuality tends to run in families. 3x greater chance of a male being gay if he has brothers, uncles, cousins, or parents (more on the mother’s side and fewer on the father’s side) who are also gay. (Pease, Barbara and Allan. Why Men Don’t Listen and Women Can’t Read Maps. p 179-186. NY: Broadway Books, 1998.)

Study of 944 men, Psychologist Anthony Bogaert of Brock University in Ontario Canada: Risk of being gay increases with number of older brothers. Some mothers may develop antibodies to male fetuses and, in subsequent pregnancies, the antibodies may impact portions of the fetal brain that determine sexual orientation. (Klein, Joe. Born Gay, the Brother Factor. p 55. TIME, July 10, 2006.)

Several studies also have shown that homosexuality tends to run in families. The probability that the brother of a gay man is gay is about four times higher than normal. Similarly, the odds that the sister of a lesbian is also a lesbian is significantly higher than normal. However, male homosexuality and lesbianism tend to run in different families: sisters with gay brothers are not more likely than normal to be lesbian. A 1993 study that traced the pedigree of pairs of gay brothers found that homosexuality tends to run on the maternal side of the family tree: the brothers had a higher than average number of maternal nephews and uncles who are gay. (Source)

Studies: the real percentage of gay twins who were separated at birth and who have identical genetic makeup is 60-70%, or 2 out of 3. (Why Men Don’t Listen and Women Can’t Read Maps. p 179-186. NY: Broadway Books, 1998.)

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