Here's my tiny contribution ^^ I myself tend to 
be more into yaoi manga than yaoi anime, as the 
animes tend to be only one or two OAV's (most 
would never have a chance to be TV, at least not 
the truly yaoi series. Lotsa cute shounen ai TV 
series, though...Yami no Matsuei and Gravitation 
are two such series (although the Gravitation 
OAV's were quite hilarious in a wonderfully kinky 
way...), but no true yaoi is ever made to such a 
scale), and thus deviod of any true plot, 
character development, or that other good stuff 
that usually drives me to want to collect art 
from it ^^ Of course, I still buy yaoi anime for 
the eye candy merits (heheeee!), but, let's all 
admit it: they're plotless. All of them ^^;;  
("Fish in the Trap", anyone? Dear god, that 
monstrosity should have never been made...how can 
you so totally butcher a manga that's only 3 
volumes? I mean, they actually managed to make 
something that had, literally, no beginning and 
no end. Mein gott...the only comprehensible thing 
about that OAV was the rape scene). Ai no Kusabi 
has the most plot of them, and even then the 
radio plays and novels are -so- much better than 
the anime (not to say I didn't really enjoy the 
orgasmic scenes, nyehehe. But, I suppose that's 
the case with a lot of manga made into OAV's, 
isn't it? ::sigh:: 'Tis the fate of yaoi). So sue 
me, I'm a sucker for a yaoi romance with an 
intricate plot ^^;; Bronze/Zetsuai also fits into 
a more plotted category, as well, and I do enjoy 
that one, but it still wasn't quite up to 
par...it's like no one expects yaoi fans to care 
that the elements of yaoi anime are not produced 
with the same quality that most anime OAV's are. 

...(continued in next post...sorry if it sounds 
snobby...it gets better ^^;;)