Well, my thought on this is not too scientific.
1. Fudge-packers focus on pleasure, not procreation. Thus, sodomites create disease, death and higher insurance premiums, because it would be discriminatory to charge AIDS patients higher rates than normal, relatively healthy people.
2. Gays cannot mate. They are not made to do so. 'Sexual relations' refers to two sexes. Since gays and carpet-munchers are of the same sex, they are not relating over two sexes. They cannot procreate and are the inverse of natural. They cannot reproduce and raise families, which is the base of procreation. Thus, they cannot marry, unless we accept one definition of marriage being the selfish hedonism of mutual pleasure in another of the same sex.
well put.
But tobacco users pay twice what others in their age group do, whether they are generally healthy otherwsise or not. Go figure.