Iyashite Agerun Saiyuuki

They are same hentai parody of Journey to the West. 

Saiyuuki, Journey To The West, whichever way you call it is a famous Chinese novel, famous enough to have a lot of adaptations or influenced works throughout Asia, of course Iyashite is one of those and is also a hentai with surprisingly good action scenes, and if you've haven't slept under a rock you'll know that in the beginning Dragon Ball was a loose adaptation of Wu Cheng'en work, so the first movie remade the first saga focused only on the journey that the monk and the other characters made, with changes in the characters and everything else, so yeah, they're both based on Saiyuuki, principally in the adventure and the action side of the story. read more 

WTF! That was my reaction when I started watching both of these insane and wacky anime. Now H-Anime usually have a poor story. However, these two didn't even try. Instead they did something different, they tried to be as insane as possible, and the results were amusing.