But that is where you are wrong
Any animals purpose is simply put the following
Birth>reproduction>death
By being gay it is a complete disregard for the life cycle and thus detrimental to the passing of evolutionary traits such as survival instincts.
That's not what I'm getting at. Maybe if the human population were reduced to like 10 people it might come into play, but with 7 billion folks on this planet
and a consistently increasing population, homoloveuality has very little bearing on the survival of the species as a whole. A couple dudes porking each other doesn't mean that they're any more handicapped than some 17 year old kid who can't control himself in the internet and like cartoon ponies.
And I don't think that you believing it's a disorder really matters at all. You aren't a doctor, it's really not your place to decide what is and what isn't a disorder. It seems kinda silly to apply your own definition to things that are already very clearly defined by people who know what they're talking about, no?