Not for everyone by any means, but sometimes you just want to sit on a woman's face and put her to work while you enjoy her efforts. Most women won't even consider it. Most of the women that do don't really commit to it and really just get close without ever really getting into it.
Rarely though, you find a woman that really gets into it, the kind of girl that will rim until you tell her to stop, the whole while playing with her own pussy and gently stroking you with the other hand.
Some of them love doing it just because they love to submit and obey, others love the humiliation and filth of submitting to the point that they will lick a man's ass, but rarely there is a woman that really gets turned on and even gets off from it. The world needs more woman that will fully commit to cock and ass worship like it was their last meal.
Damn I could really go for some of that right now