Emanuele Ciriachi said:
I think that religion does not enter the picture here.
Since it's one of the foremost cultural drives behind the conviction that marriage and sex should be about procreation alone, I find that doubtful. It's certainty a motivation for Card.
Emanuele Ciriachi said:
I believe that you see only the similarities between heterosexual and homosexual unions - which is mutual love - and thus assume that this is the only requirement for marriage. But you leave out of the picture the one, fundamental difference that homosexual couples will never be able to emulate, and this difference is precisely what gives marriage its privileged status.
So give the benefits and privileges to people raising or caring for children, and leave marriage or sexuality out of it. Also remember that some of the benefits we give to the married are inspired by cultural preferences, prejudices or assumptions that say that people who have children should/must be be married, and vice versa. But not all of us subscribe to such values(in fact, I'd say most of us don't).
As for marriage itself, is there a requirement for all married couples to have children in order to stay married? No? Then having children is not a requirement for marriage, (and when was it ever? Encouraged, perhaps, but mandatory?)
Do you think there should be such a rule? If so, then straight/infertile people getting married for love alone should be treated the same way as gay people wishing to get married for the same reason. And if not, then what's the problem?
Emanuele Ciriachi said:
I maintain that any society needs children to continue to exist; of course, in certain parts of the world we need to make less than before, but nonetheless children are and will always be fundamental to progress.
And I ask you again; how would gay marriage stop the boatloads of horny straight people from doing just that? I should also note that marriage rates are falling in countries like the US (where having children is not nor has ever been a requirement for staying married), but population growth is either holding steady or still rising, so what makes you think that marriage is required for effective reproduction again? You could argue about social stability about having or raising children out of wedlock,but that's a separate issue.
Emanuele Ciriachi said:
If you see this as a reason to extend marriage to homosexual couples, the next discrepancy would be, "why are polygamous unions denied the same rights? What about blood relatives? And what about singles that cannot find a partner?"
Ah, the whole slippery slope argument. "Well, then we'll have to allow everything to get married!" Firstly, marriage is traditionally held to be between a consenting adult man and woman; gay marriage just takes out the gender specification. So let's go down the line; I'll also list some things you didn't mention, but that people often do in these cases;
Blood relatives--inbreeding. And in parent/child cases, pedophilia/exploitation--double whammy. I should note that, at least in the US, marrying your cousin is legal (and actually not too bad from a genetic standpoint, as long as it doesn't happen repeatedly over multiple generations)
Children--can't give consent, higher chance of physical harm
Animals--can't give consent, diseases
Inanimate objects/corpses--can't give consent. You might love it, but the reverse is certainly not true.
Singles: do you mean getting married with yourself? If so, please stop trolling me.
Polygamy; a question I've asked myself before. Personally, I don't see any inherent problem with polygamy, at least on a case by case level. If three consenting adults what to live out in the woods together, no skin off my back. Personally, my problem with polygamy on a social, widespread level is that it generally encourages, reinforces, or is the result of gender inequality (typically against women). Plus, if marriage with one person at a time is messy enough, I hardly see how adding a second person will improve it. But no, I don't see allowing polygamy as an end all "no we can't go there!" place you seem to think it is.
At any rate, I'm wondering why YOU oppose polygamy. You thus far have defined marriage as being about having children; what arrangement is better suited for that then polygamy? Some cultures who have it endorse it specifically for the reason of breeding and expanding the population, and force or obligate women, regardless of their wishes, into such marriages so they can be good breeders for the state/the lord/society.
To sum it up, the way I see it, you need to do three main things;
Show how gay marriage hurts straight marriage (in a way only gay marriage does)
Show how straight marriage is the only good way to reproduction
Show why reproduction is so important that nobody who is capable of it should be exempt from doing it(and if people can be exempt, why not homosexuals? They're not so numerous and wouldn't they just have an increased chance of having homosexual children anyway?)
So far as I can tell, you haven't done any of this yet, only vaguely asserted it.