this might have been asked for before, but I think this variation might not have been mentioned.

I'm looking for mangas where the main character is a man slut.

Now, before you go suggesting manga where the guy is a "player" I should explain the difference.

My definition of a "player" is someone who dates lots of girls and has loads of sex friends.

My definition of a "man slut" is someone who has absolutely no attachment to them other than at the crotch (hehe). He doesn't date them, doesn't befriend them, nothing. He just seduces them or fucks them when they open their legs and offer themselves.

I'm looking for something along the lines of a shoujo or a josei, but a seinen/shounen would be ok just as long as it was more serious and not an ecchi comedy.

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Feed your head.

Kirai but you might already know about that one. He doesn't date or care for any of the girls. He just screws em.

I never read smut so I can't be sure, but Stroke Material probably fits...I think.

desire its seinen but it has a guy who seduces women and they never appear again