I've been trying to find the name of that movie for YEARS! The film is basically a series of fucked up sexual events which usually result in the death of each male and female ninja participant.
Here's one I captured back in 2002, "The Dick Stick"
He raises a tree, attaches a wooden cock to it, then the girl fucks the tree! To get back at him, she starts producing acidic milk from her breasts which he chokes on! They both die!
http://thsrv.com/p/dickstick-large.mpg