Up until the 1960s, many nations in the world considered Sodomy to be at least a mental illness, at most a crime warranting severe punishment. Yes, there is forgiveness for sin in Christ Jesus, however God’s Word does not, and will not change. The wages of Sin is death. I do not believe that the later dispensations negate the previous ones. Rather, the previous dispensations were foreshadows of the future ones. The later ones fulfill the earlier ones...
I’ve been down a discussion of why this one hit the head of the rogues’ gallery in the scriptures.
The thinking Christian’s answer (while thought is still not forbidden) would probably be that it instinctively revolted most people and this was backed up by its contrast to the well instinctively understood imperative to be fruitful and multiply. If you wanted an example of something very bad, to emphasize just how bad sin can get, just about everybody would agree this was.
In the modern day, our modern, unnatural “zero population growth” people have persuaded many that the imperative to be fruitful and multiply is passe. It is a small step in the world from such a presumption to the idea that sex perversion is benign. I’m not surmising here; I had a CHILDREN’S science book from the 1950s that said so. Written about 70 years ago.
Christ, for His part, came to save this kind of sinner every bit as much as to save the adulteresses he met. And even more, to head off this kind of sin in the first place: “Suffer the little children to come unto Me.” He isn’t the one with the difficulty at all. WE are the ones! We don’t have to make it a big issue but we do because we are weak... not because we are strong.