I took an advanced crime scene investigations class once. In addition to lots of great material on other crimes (burglary, home invasion etc) the instructor had been in homicide for almost 20 years, so this colored a LOT of the lecture. One of the sections he covered was AEA... which included a video that one victim shot of himself for... later use. He wasn't masturbating, but he had panties on his face, had gussied himself up with some fishnets, the whole 9 yards.... right up until you saw in his actions that he realised he was in trouble.