Either Shoujo Sect o Rin: Daughters of Mnemosyne. Shoujo Sect is più sex-based sexy and Rin: Daughters of Mnemosyne is like stereotypical o mainstreamed sexy.
3 sexy men from Real da Takehiko Inoue. This was probably the saddest manga I've ever read in my life. I cried in every volume... :( But it's a fantastic read!