I've not conducted a scientific study or anything, but from my own personal experience and what I've read from others, women aren't as keen on it as men seem to be. I enjoy receiving, but I make excuses not to do it to my DP. The thought of putting my tongue in his bum makes me boak. I won't do it even if he's just hopped out of the shower. Are others on MN more keen on it than I am?