I know that yaoi manga doesn't satisfy your craving, so I'm taking the liberty to list some shounen ai/ yaoi anime that I've either seen or heard about.

And since I'm not allowed to give the direct links to yaoi stuff, I'm going to give the general websites that you can find these anime. And I'm even going to color cordenate them so it's easier to find them.

Here's the websites:

animeseason.com

youtube

animefreak.tv

by the way, these are sites I know where these anime are.

And here's the list of anime:

Gravitation
Junjou Romantica (1 and 2)
Sekai-ichi Hatsukoi (1 and the 2nd one is currently ongoing and there is an OVA for this series as well)
Koisuru Boukun (also known as The Tyrant Who Fall in Love)
Papa to Kiss in the Dark
Sukisho
Okane Ga Nai! (aka No Money)
Loveless
Sex Pistols
Kirepapa
Togainu No Chi (doesn't quite have the shounen ai feel to it, but it's originally a yaoi video game)
Patalliro Saiyuki
Uragiri wa Boku no Namae wo Shitteiru
and Sensitive Pornography

red= animeseason and youtube
blue= youtube
green= animefreak and animeseason
purple= animeseason
orange= animefreak

Feel free to post anymore anime I've missed.