It is, however, one of the unenumerated rights of the 9th Amendment. I have yet to see anyone use the text of the Constitution to show otherwise. And I don't disagree that gay sex is immoral and evil. Slavery was immoral and evil as well, but it was guaranteed in the Constitution. It took a Constitutional amendment to remove it and a similar amendmwnt is required to remove buggery from the scope of the 9th Amendment.
"Gay sex" often involves disgusting practices which we have all heard about but I will very briefly mention here (fisting, Sadism and Masochism, bondage, "golden showers", scat rolling, wildly anonymous multiple partners, etc). Do you find all of these practices moral, then?
Are there any sexual practices that you do find immoral? (Not counting forcible rape since I assume that everyone here finds that immoral.)