From an earlier thread of mine:
2 Peter 2:6-8 also characterizes the sin of Sodom as sexual but greatly expands on Lot's reaction to the fornication: "He rescued the righteous Lot, greatly distressed by the licentiousness of the wicked, for by what that righteous man saw and heard as he lived among them, he was vexed in his righteous soul day after day with their lawless deeds."
There is nothing in Genesis about Lot's reaction towards the "wickedness" of Sodom -- indeed there's even a hint that Lot was wicked himself. First, we read in Genesis 13:11-13 that Lot "moved his tent up to Sodom. Now the men of Sodom were evil and very sinful against God". Given a choice of where to live in Canaan, Lot had moved right into Sodom -- a questionable choice at best. Then the "three men" are sent to destroy the cities (cf. 19:13), and Abraham pleads with Yahweh to save the cities if only ten righteous people can be found therein. When the angels arrived at the cities, Lot showed them his gracious hospitality and this is what "won [God's] favor" (v. 19) and "Yahweh felt pity for him" (v. 16). So if Lot did not show his kindness, he might have perished (as did his sons-in-law in his household, 19:14-15, 31). Thus Philo (Questions and Answers in Genesis 4:54) concluded: "Lot was saved not for his own sake so much as for the sake of the wise man, Abraham, who had offered prayers for him," and Origen (Homilies on Genesis 5:3) remarked: "If he was able to escape Sodom, as Scripture indicates, he owed this more to Abraham's merits than his own". Yet 2 Peter characterizes Lot as a righteous man who was disturbed by the sin that he witnessed in the cities. This assertion was anticipated by Wisdom 10:6-8 which intimated that Lot was "a righteous man" and the Alphabet of Ben Sira, 268 later referred to Lot as "a wholly righteous man".
http://www.jehovahs-witness.com/10/67328/1.ashx
