Recently I had been reading this novel called The Tragedy of Ms. Geneva Flowers by Joe Babcock in which I came across these lines:

"Then I separated his cheeks and looked down at his puckered pink anus which looked like the tiny knot in a pink balloon. .... Suddenly it looked like a little baby monster."

I find the comparision ridiculous but I am not yet sexually active and can't say what it feels like when you first encounter a butt hole. I hope the guys responding to this post would come up with some better or funnier one comparisions.