Well how many times in the whole of the Bible is Sodom and Gomorrah mentioned? It is referred to at least by name 9 times in the New Testament alone.
I am quite in agreement that homosexual acts are sinful.
I just disagree that the Bible, the NT anyway, provides much support for the notion that they’re greatly more sinful than other types of sexual sin.
In my experience this is often because people feel much more comfortable denouncing sexual sins they haven’t participated in personally or aren’t tempted to engage in themselves.