Not a Disorder
There's no test that identifies a person's sexual orientation.
If ur son is gay -primarily attracted emotionally, psychologically & sexually 2other males- he'd b the one w/the answer. If he's part of a family, community, culture &/or society that condemns individuals who're gay, he may choose 2share this w/few others, if he chose 2share this at all. Real parents like u speak: http://bit.Ly/zaqbih.