I've wasted spent time reading TVTropes' page on Saiyuki.

Although it seems like that's most of what I read as a kid -- maybe because the children's books I liked best fell into that category -- I don't read much in the way of fantasy anymore, but I'll have to keep this series in mind. Seeing as my top three Saiyuki pairings all include him, I'd have to say a Sanzo Who Is Getting Some is a Saiyuki fanfic favorite.