Leo in Beast Master maybe cute, but the male characters in his other works are really manly. I was reading Dengeki Daisy and I was like "Damn, it's different when the mangaka is male. He CAN draw guys."
I wonder if you are talking about the character or the art. I, too, prefer reading shoujo where the male is a man rather than a boy. But then again I am 29 I recommend the manly men in: The One, Hapi Mari, Masca, Akuma no Eros, Honey Hunt (manager), Kiss, Sensei, Nana (Takumi), Legend of Nereid, Red River,