Is homosexuality natural?

Biologically speaking, Is it natural for a species, that reproduces sexually, that would be the only base biological reason for a species to even have a sexual desire, to contradict that nature, even sometimes be appalled at the thought of heterosexual behavior, for a desire that cannot possibly produce offspring? You can say you see monkeys do it, but that doesn't mean its good for the monkeys, or that its how their bodies reproduce, either, that would be the reason a species even has a purpose in developing a sexual desire, or the traits that would even make it feel good. Let's just say, homosexuality, doesn't seem like it would be a very powerful trait in natural selection. The only thing left is to think of it as a behavioral disorder( insanity), even for the monkeys. You will find that organisms that lack the ability to reproduce are usually hybrids, or that lack favorable genetic traits that are best for a specie's future generations. Many such other things that prevent reproduction are thought of as dysfunction, disease, or deformity, as well. Reproduction is one of the 7 things that science and biology even use to classify life. Obviously, something that prevents what is best for any of those 7 things would classify as something that is against the nature of life. Homosexuality isn't against everyone's religion. Its against the biological dynamics of life. Homosexuals are willingly diseased people who want to accept and force other people to accept them for their preference of living in subject sucking up to the dysfunction of their disease. It may not sound pretty, or politically correct, but its not biologically sound behavior, not even for animals.