Found crash course about the subject. to help some people to get it.
how important it is to understand hormone do everything.
he explain really well.
Know we know hormones are pump during the gestation.
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Hormones cant stay into the body of the woman for years.
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Estrogen is the feminine hormone.
Many research link hormone during the gestation into the switch between girl to virile male and everything in between.
PC article said by observation each time a woman has a male pregnancy, the chance that her next son will be homosexual increases by 33%.
So the first born have less chance to be gay than the 5th male born.
too much natural variation in testosterone, which should normally happen later in a pregnancy. Epigenetic processes prevent female fetuses from becoming masculinized when testosterone exposure gets too high, and vice versa for males.
Moreover, epi-marks also protect different sex-specific traits from swinging in the opposite direction; some affect the genitals, and others may affect sexual orientation. These epi-marks can be transmitted across generations from fathers to daughters, or mothers to sons.
Essentially, Rice and Friberg believe they have discovered the presence of "sexually antagonistic" epi-marks — which sometimes carry over to the next generation and cause homosexuality in opposite-sex offspring.
And importantly — in order to satisfy the rules of Darwinian selection — the researchers noted through their mathematical modeling that these epigenetic characteristics can easily proliferate in the population because they increase the fitness of the parent; these epi-marks normally protect parents from natural variation in sex hormone levels during fetal development. They only rarely reduce the fitness of offspring.