Well see just like a straight person they don't develop the desire for "affection" right at birth....it's usually when you get to that age in life where you begin to feel attracted to either male or females. Every gay friend I have ever had has always said they found out they were gay when they were in like 4th or 5th grade. Also by using the theory that it is an inherent trait rather than a choice it backs up the mystery in two gay parents raising a straight person or two straight parents raising a gay person. If it really was by choice than that would mean it would have to do with the way a child grows up. So if it really was a choice than people raised under a household that expresses the idea of being gay as normal would in turn raise a child to become gay. But this in fact is not true because there are many instances that occur in which a gay person grows up in a straight household, some even being heavy conservatives, and a straight person growing up in a gay household.