So I'm looking for a manga with a story kinda like that: A seductive girl who has always been playing around with guys just like a past-time. And A charming guy who has been sleeping with girls just for fun. And one day those two meet...
What you want sounds a lot like a few projects Shoujomagic is working on / has worked on. Can't really think up of any of the titles 'cause I tend to pass those kinds up, but if you look around their projects page you might find what you want. Hope that helps.
