"Now Lot went up out of Zoar and settled in the hills with his two daughters, for he was afraid to stay in Zoar; so he lived in a cave with his two daughters. And the firstborn said to the younger, "Our father is old, and there is not a man on earth to come in to use after the manner of all the world. Come, let us make out father drink wine, and we will lie with him, so that we may preserve offspring through our father. So they made their father drink wine that night; and the firstborn went in, and lay with her father; he did not know when she law down or when she rose. On the next day, the firstborn said to the younger, "Look, I lay last night with me father; let us make him drink wine tonight also; then you go in and lie with him, so that we may preserve offspring through our father." So they made their father drink wine that night also; and the younger rose, and law with him; and he did not know when she law down or when she rose. Thus both the daughters of Lot became pregnant by their father. The firstborn bore a son, and named him Moab; he is the ancestor of the Moabites to this day. The younger also bore a son and named him Ben-ammi; he is the ancestor of the Ammonites to this day"
I have never really understood the use of Sodom and Gomorrah as an argument against homosexuality, not that I truly understand using the Bible as an argument for or against much of anything. The entire story is pretty crazy... the town is full of rapists who want to fuck anything that moves, yet I'm supposed to believe that the problem God has with the place is homosexuality? I'm not arguing that the passage supports homosexuality, but it's clearly not the focus of the story. But, what I find really interesting are the other aspects of the story, because... well, things get pretty weird.
First, the supposedly righteous Lot is pretty quick (in a scene very reminiscent of Abraham's willingness to sacrifice Isaac) to offer up his daughters to the crazed mob as a substitute for the angels, yet is rewarded by being saved, while his wife is turned into a pillar of salt because she decides to look back at the destruction. Furthermore, and correct me if I'm wrong, Lot's daughter's don't seem to incur any divine retribution for raping their father. The usual argument I get when I bring this up to people is that they believed they were the only people left on earth and were trying to repopulate it. But, that doesn't make much sense. First, it is clear that God's wrath is against Sodom and Gomorrah (for, I would argue, being horrible, violent wretches, and having nothing to do with their sexuality) and he doesn't have plans to wipe out all of humanity. Secondly, God sends Lot's family to Zoar, which seems to be another city, and thus should be populated to some extent. This is a bit more tenuous, but only reinforces my point that the whole story is pretty nonsensical. I imagine the entire point was to poke fun at the Moabites and Ammonites rather than be some sort of moral story, but who knows. It seems to me like they both just had some serious Electra complexes. They couldn't even wait a day to get the guy drunk and have their way with him? That's pretty desperate, especially if you think you're the last people on earth.
So, the next time anyone tries to use Genesis as an argument against homosexuality, I'm just going to quote Genesis 19:30-38. You know what... forget that... It's a good passage to bring up in pretty much any old situation. Oh, and... someone get to writing a book from the perspectives of Lot's daughters. That'd be an interesting read.