I've seen the first series and there's nothing so far that's blatantly yaoi (unless you're like us and looking for it!). I don't think there is in the second series either. So you should be fairly safe ^_^

Mor pic pimpage I'm afraid. An image with the sexiest Hakkai I've seen!

http://www.madamhydra.net/img-scan/syk/saiyuki-folder.jpg