"My theory is that women under a particular kind of stress at a particular time of gestation causes changes in the hormonal makeup of the fetus/baby and causes homosexuality."
I prefer scientific statistics. For example, most practicing homosexual women have had an abortion before engaging in same sex behavior. Post traumatic stress disorders are probably what lead women to a defensive same sex attraction. Defensive, because to kill one's own child is a terrible tragedy. Many homosexual women don't stop being attracted to men (and are statistically more promiscuous), and I seriously doubt that "born gay" has much to do with such behavior. The human heart is always hungering for True Love. We will never find rest until we rest with God.
I believe many gays are children who were neglected by a same sex parent; they're always looking for that parent's love and approval that they never got as children.