I'm going to apologize straight up, because this will be the worst description ever. However, please try to help me.
I remember reading a manga, where the main guy boxes. And then there's a girl, who I seem to remember being kinda slutty or trashy. Maybe. I think the guy is called rabbit. And she is interested in him, while he couldn't care less. That's pretty much all I got. Ring any bells?
And if this doesn't ring any bells, I'd like to read some manga with a slutty character in it. The slut can be a girl or a guy. No yuri, but yaoi and shojo/josei is cool. Nothing really graphic, though. I'd prefer for it to be implied than anything... If that makes sense. Also. I like plots/points/story lines. Just to point out, a slut is not the same a player, so don't recommend that to me. An example: Mu from Otona Keikenchi/Koibito Kijunchi. Oh. Yeah. The slut doesn't have to be the main character. Just present. The bigger the presence, though, the better.
I don't know if this is one manga you'd like to have, but it's a parody on this generations blondish-behavior among girls, like Paris Hilton and so on, atleast thats the feeling I get from it, and at the same time its serious.
Theres the main character who whants to become a prostitute, and becomes friends with a isolated girl at school that theres going rumors about to be a slut.
Theres aswell Kanamemo but its an anime, were one girl is a lolicon and really funny, but it's a Shoujo Ai anime, not Yuri.