Nature mandates certain things to occur every day. Eating, drinking, breathing, surviving, using the bathroom, etc. We only need these things to survive.

And then, we started to progress beyond our sole animal insticts. We started to do things for pure pleasure. Video games are not needed. Television is not needed. Non-proceational sex is not needed. Yet we still do these. Why? We do not have natural video games. We do not have natural televisions. These are merely luxuries created by the power of the human mind.

Our only purpose with these is to be happy. Yet happiness is not needed, correct? We can just live with nature. Correct? Cast away all of our non-natural materials and just live like that. Yet no one would. Since we have evolved beyond nature. We go against nature every second of the day. From harnessing electricity to using the shower, nothing is natural in this age.

Homosexuality may not be natural. It may not be a choice either. But does any of that really matter? If you are so concerned with everything being natural, then throw away everything that isn't natural in your life. You won't though. So don't you going around talking about nature when you yourself are being a hypocrite.

Who benefits from it being illegal? Nobody.
Who benefits from it being legal? Homosexuals.
Who is harmed by it being legal? Nobody.

Going legal seems like all pro no con. The only thing hurt would be the feelings of a super conservative who has wwwwaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaayyyyyyyyyyyyyyyy too much gay sex on their mind for a person who allegedly isn't gay.

from Google Web Definitions, Natural means:

"existing in or in conformity with nature or the observable world; neither supernatural nor magical"

explain, using this definition, how they or there behavour is un-natural?

Specially when homosexual behavior in animals has been documented in over 500 species...you can't get more natural than that

http://en.wikipedia.org/wiki/Homosexuality_in_animals