Taken via Andrew Sullivan from a 1997 text from the newly un-excommunicated
Catholic Bishop Williamson:
...That is why homosexuality is sometimes called "the sin against nature".
In fact the sin is so unnatural that Mother Church ranks it alongside murder, defrauding the worker of his just wage, and oppression of the widow or orphan, as one of the four sins "crying to Heaven for vengeance". However, God did not wait for the founding of the Catholic Church to instill in men the horror of this sin, but he implanted in the human nature of all of us, unless or until we corrupt it, an instinct of violent repugnance for this particular sin, comparable to our instinctive repugnance for other misuses of our human frame, such as
coprophagy http://www.sspx.ca/Documents/Bishop-Williamson/October8-1997.htm (see also
Wikipedia)