These two I love very much.
Spreading a womans ass cheeks, smelling the erotic scent of her anus and then first kissing her little, dark hole only with my lips, very gently... and then, only then... when I'm totally intoxicated by the arousing smell I start licking her sweet little hole in the most devoted way.
This may sound very perverted, but I do even prefer her not showering for a day or so before we do this (but please no crapping in between, I don't like feces).