From the Shaar ha'Tefillah by the Beer Mayim Chayim
"And it is not seemly and it is not proper for an intelligent person to run after the filth and desire of this sort, for why is he called man if not for having the spirit of man which ascends above and not that of a beast that descends below to the earth, and every intelligent person knows that it is proper for him to be different from a horse and a dog in his desires".