OMG, yaoi is like, my life (not really, but you know what I mean...)
Series I've watched:
Loveless
Sukisho!
Gravitation
Papa to Kiss in the Dark
Enzai
Kyou Kara Maou!*
Sensitive Pronograph
Descendants of Darkness*
Boku no Pico
My Sexual Harassment
Earthian
Junjou Romantica (+S2)
Lesson XX
Kizuna
Fish in the Trap
Okane ga Nai
Angel's Feather
Gakuen Heaven
Marginal Prince*
*Not sure if it's considered an actual yaoi anime
And of course, I love slash. Sometimes slash pairings are the best. xD