The whole Sodom and Gomorrah story shows how inconsistant the bilbe really is. First of all, these two cities are brought to 'hovahs attention by a large outcry:
"and the Lord said'the outcry of Sodom and Gomorrah is indeed great, and their sin is exceedingly grave.'" Gen. 18:20
Where did this outcry come from. It couldn't have come from the residents as there were not 10 righteous people to be found there. Who in this day and age was able to judge righteous? There had been no commandments telling people what they could and could not do. Abraham was the only person God was speaking to at this time, and I've found no evidence of him witnessing outside his family.
So Jehovah sends two angels to take care of his business. When the men of the town see the two angels, they immediately want to have sex with them. So the one righteous man in town, to save his and the angel's asses, offers the townsmen his two virgin daughters. Nice father, huh? He's definately someone I'd want protecting me
So all the righteous people evacuate the town, before it all gos up in flames. Unfortunately there are no men left anywhere for Lot's daughters to breed with, so they both get the old man drunk and have their way with him.
So lacking any clear laws laid down by Jehovah, what we can conclude about sex and Sodom and Gomorrah is that homosexual sex with angels is definately out, raping or offering up of virgin daughters is fine, but incest is definately O.K..