This word translated abomination is to'ebah in Hebrew and is frequently found in the Old Testament. If one reads it in context every where it appears it is always connected with idolatry - never homosexuality. The people of Sodom were involved in idolatry. That would mean that we would be just as justified to claim that the sin of Sodom was that of shellfish eating, beard trimming or that the sin of Sodom was menstruation on the part of the womenfolk for the same reason. A view of strange flesh comes from Gen 6.
Strange flesh means a linking between angelic flesh and human flesh.
Remembering that the two visitors to Lot in Sodom were angels, we see this was also going after strange flesh. This has nothing to do with homosexuality, but of the mixing of two distinct orders of creation. Judges 19 tells of a very similar event in Gilbeah, using the same words as in the Sodom story, except that the house guest was a man, not an angel, and the people accepted the concubine women visitor of the man. The concubine was raped until she died and the city was destroyed. As in the Sodom story, the sex of the victim is not important, it is the violent abuse of the stranger not sex that is the sin.