Christian Emperors Constantius II and Constans wrote a law that reads like thus:
When a man marries and is about to offer himself to men in womanly fashion [quum vir nubit in feminam viris porrecturam], what does he wish, when sex has lost all its significance; when the crime is one which it is not profitable to know; when Venus is changed to another form; when love is sought and not found? We order the statutes to arise, the laws to be armed with an avenging sword, that those infamous persons who are now, or who hereafter may be, guilty may be subjected to exquisite punishment. (Theodosian Code 9.8.3)
IE: NO HOMOS MARRY.
So, about that whole "acceptance will bring the end of civilization" thing...