Men's annal's are not for pleasure.

Nothing could be further from the truth, hence the male G-spot being located where it is. See http://allwomenstalk.com/finding-the-male-g-spot/ for further info. This is God's Holy Work, creating Man in his Own Image, anal G-spot and all, thus allowing for the potential & desirability of anal penetration by virtue of a) proximity and b) the potential for mutually climatic pleasure. Talking of which, there's a choice piece of graphic anal sex & orgasm in the Song of Songs, Chapter 5, Verse 4.