That would be a great tagline, if it weren't so icky!
From a medical standpoint, the anus should be an out door only because of the capillaries being so close to the surface....unlike the vagina.
College students tried to say that women get AIDS just as easily as men, etc. etc. Then one little girl chirped, "That's because of anal sex becoming popular."
I said, "If you go swimming in a sewer, you may catch something." I explained in vague terms that many diseases can be caught only through familiarity with that part of the body.