Regardless what passes for fun between consenting adults, I think if the Good Lord had intended the anus for the penis, he'd have supplied everyone with their own can of Crisco.
The "liberation" that is taking the French cut bikini to a thong (Naked Ape style) and pornographer's push for anal porn and the tender trap that is wooing men with lesbian sex is absolutely calculated. Diabolical back to front.
Anal sex, as you have called attention, is just so disgustingly repulsive (and, not to mentioned, highly dangerous from a hygiene point of view). E-coli bacteria from our intestinal tract just doesn't go with genitals. People are nuts who do this. Feces and love are definitely not made for one another.