"It's ironic that homosexuals speak about not wanting people to tell them how to live, but then they demand that they can be "married," in essence living how society expects heterosexuals to live."
Choice, jackass.
Being told, "Don't be gay. It's icky," isn't giving anyone a choice. Saying, "If you want to get married like everyone else, go for it," gives choice. Nobody is telling or forcing gay people to get married and "[live] how society expects heterosexuals to live."
"Homosexuality is a mental illness;"
No. It's not. Actual doctors who study such things for a living for a good portion of their lives said so about 30 or 40 years ago.
"those afflicted with it are inclined to not use their reproductive anatomy for its intended use."
How about this: you use your "reproductive anatomy" any way you like and let everyone else use theirs any way they like. It is, after all, theirs and not yours so you don't really have any say in the matter.
Deal?
"Psychologically, that has to be a damaging trait, yet homosexuals embrace it."
Damaging how, exactly?
"That's like a man who refuses to walk, opting to always sit and use his legs only to move his chair in and out. Sure, you can live that way, but it's a waste of a good set of legs."
Again, they are not your legs. You have absolutely no say in what he chooses to do with them.
Mind your own fucking business.