Good arguement against same-sex marriage?

[Guest Josip]

Is this a solid arguement, I used it partially with my friend, we didn't finish the convo. Can you guys pick it apart, and hopefully strengthen it? Ideally, I would like a short compact arguement that is easy to remember.

I asked him what good came out of a homosexual act. He said because it is love. Then I said, frankly, well if I were to have sex with my sister, is that love. (he actually said yes, he felt cornered, i didn't mean that, but thats not the point)

Then they should invariably say, no its not love, because good doesn't come out of it, i.e. the baby is messed up.
To that I would ask, well what if I had sexual acts with my sister that did not produce a baby, is it still love, does good come out of it?

They should invariably say no. If yes, then ask why, and if they seem to understand the wrongness of their decision, point out that there is no point in continuing the conversation (“if you try to convince a man against his will, he will remain of the same opinion still”)
With a no answer - And there I would point out that these acts are wrong because they are out of lust, not love, and furthermore no good comes out of them.

And homosexual acts are the same, they are out of lust, and no good comes out of them.

In contrast, marital acts produce a good, and are natural.

So is this a good way of arguing, getting them to prove that good comes out of a homosexual act?

And ofcourse, if someone says it’s their right ot choose, and we should recognize the choice I would say…
Just because one is free and willing to do an act, does not make it morally acceptable. For example, if someone wanted to end their life, and another person wanted to kill someone, then letting the one kill the other would not be right. Just because both parties consent to the act, and are free to do it, does not make it a morally acceptable right, and hence should not be recognized.

[Lil Red]

moved to apologetics phorum

[thessalonian]

It's a good arguement albeit that I was retching as I read it. It's sad we have to go to such distasteful lengths to make a point. Sex is not love. It is an expression of love but only if in the right context as God intended.