i have never tasted it because it turns me on and i've never like licked my fingers after masturbating, but surely girls here kiss the guy they're with once they've gone down on them? it's pretty much the same thing.
I do it when I'm with guys because I think it's sexy. It's odd though, considering I think it's a huge turn off for a guy to taste his juices.
I also do it alone in the restroom or when I masturbate. But that's for health reasons. I'm pretty informed about my body, and a sour taste can sometimes point to infection.