Yes I have. Yes I like going down on her. Why? 'cause it's fun to please the person you care most about. I enjoy sending her on a trip.
[size=10]Also, that way I get to be the dominant one, at least for a short while ;p[/h]
I dunno about cleanliness though. I prefer her not having desi-scrubbed genitals :p. A) It prevents infections, B) pheromones. That - B) - is also why I don't particularly care about showering first (plus, "sometimes" you don't wanna break the flow).
It's almost become a standard for girls to go down on guys, so I suppose guys should at least do the same for girls.
I dunno. I've never even met people other than Christian fundamentalists and 90 year olds who would have thought oral sex something out of the ordinary.