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54: Why Science May Pressure Policy Change on Homosexuality

Latter Day Struggles

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Epigenetics Does Play a Large Role in Gayness

15 to 28% of gay men owe their sexual orientation to birth order. The mechanism is not completely understood, it appears to be due to interactions between the male fetus and his mother's immune system that have increased consequences for each subsequent male birth. Daughters do not experience a similar phenomenon, nor is the effect on sons influenced by the number of older sisters.

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