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M*W: Exactly. Some research has been done linking homosexuality to the function of the hypothalamus. Other research has been done in male twins where one is gay and the other is not. The most recent research I've heard about regards male siblings in a family where there was a higher statistical significance of homosexuality in older male siblings.
I've always believed that the conditions in the womb which is bombarded with massive estrogen plays a role in homosexuality. Then of course the food we eat is ridden with antibiotics, hormones, pesticides, etc. Cows are given hormones to make them produce more milk and beef cows are given hormones to bulk them up for greedier sales. The only way to avoid the probable hormonal influence to one's fetus is to eat organic foods only. Then, again, the mother's hormonal health is important.
With all these possibilities for hormonal influence, we have been seeing a higher incidence of homosexuality (male and female) since 1970. I also think that prenatal ultrasound plays a role that influences untoward conditions in the fetus. It can damage speech and hearing and cause blister like lesions in the fetal brain. Prenatal ultrasound is for the most part unnecessary. It's mostly used for the convenience for the doctor's scheduling purposes. However, genetic defects can be detected with ultrasound, so it can play an important role in fetal outcome.
After the infant is born, it is also bombarded with hormones from its food supply. I don't think things will change anytime soon. We are products of our environment, and homosexuality is a natural born characteristic. It's not a sin, and they shouldn't be shunned nor discriminated against anymore than you would shun and discriminate someone with blue eyes.