It only really occurred to me recently to question the legitimacy of homosexual marriage outside of God's disapproval of it. "God doesn't like it," is really a terrible argument against anything because God may dislike completely arbitrary things. But what is marriage, really? Why does it exist and to what end? Marriage seems to be predicated by the advent of private property, which led to the idea of inheritance. At the heart of it, marriage is built upon the distribution of wealth within a family.
But modernity has interpreted the institution of matrimony differently; it has become all about romantic love, which, while a clearly important part of marriage and parenthood, is very fickle and fleeting. Marriages end because they are now centered on passion rather than a higher ideal behind that passion. As looks fade and familiarity breeds contempt, marriage becomes a neverending hedonic cycle, into which some are born purely from circumstance.
Marriage as a means of inheritance would exclude same sex partners because they produce no heirs. Of course, by that logic, marriages involving persons who are sterile or infertile would also lose their legitimacy. Then again, adoption is a possibility among any of the aforementioned pairings, and wills may be drawn leaving wealth to any heir at a person's whim.
So what do you think? Is marriage about inheritance. Is it about love? Is same sex marriage a meaningful thing to desire?