Here's an undeniable scientific fact:
That among mammalian species, heterosexuality is the predominant genetic and sexual trait. There is a reason for that. For a species to survive it must reproduce. This happens in one of two ways: sexually (by male and female copulation), or asexually (fission). Now, homosexuality does not belong to either of those methods of reproduction. Scientifically speaking, homosexuality takes away from the reproductive capability of a species. For a homosexual couple to raise a child, they must take advantage of reproductive process to do so, through surrogacy or if a lesbian, using the services of a sperm bank. Another is through adoption. If Homosexuality was normal in human beings, wouldn't you see a wider distribution of homosexuals in proportion to heterosexuals?
Now, I have nothing against homosexuals, but science proves that it is an abnormal trait. It is a recessive trait among the human species in particular. If you still don't believe me, explain why less than 3% of Americans and 1 in 5 people worldwide are gay. This signals that it is an aberration in human development.