"it is agreed by all medical and health care professional that orientation is not related to a child's postnatal social environment."

Well, that's just a verifiably proven outright lie. So much for your book. Ah but we all know what you're response will be. That by "all" you mean all those who are "credible" according to YOU because they agree with your fallacious POV.
There is NO such thing as a "sexual orientation" toward anything other than the "orientation" God gives all people. The truth is Same-Sex Attraction (SSA) is NOT the same as "sexual orientation". Just another lie to perpetuate your Liberal agenda.
But hey, thanks for publicly displaying that you and UC Davis think one putting their opinions into a published book and giving it a fancy name somehow makes that "facts".

Of course, you won't be intellectually honest enough to admit that.