why do you think the hormone would be deficient, if not for the genes?
I would think it would be a malfunction of one of the endocrine glands. A malfunction not a genetic problem. Here's my quandary: I'm thinking that if it is purported to be genetic, why would heterosexual parents have gay children?
Hormones can be deficient from organic malfunctions such as thyroid trouble or cysts or tumors in other glands.