amount of yaoi manga if enormous. wewe should specify what kind wewe like to read, in order not to be disturbed au bored au waste your time otherwise...
I've never read Yaoi mangas but i've seen manga picha that might sound good. I only know two though. Junjou Romantica Sekai Ichi Hatsukoi. They are both from the same writer. I dunno if wewe want hardcore au soft yaoi but that's all I really know.
i suggest wewe read manga created kwa sakuraga mei if wewe haven't already read it. they're really good, the art, all bishounen and all. and maybe read some stories created kwa minami haruka. there are some cute characters in her manga. and of course there's those really maarufu anime, which i'm sure wewe must've watched already, and i really like this anime,kuroko no basuke, although its not yaoi, but there are lots of yaoi fanfics on this anime.