Now, now, it might not necessarily be an erotic thing. He could simply have self-loathing issues mixed with dominance issues. Strangling is considered to be one

Now, now, it might not necessarily be an erotic thing. He could simply have self-loathing issues mixed with dominance issues. Strangling is considered to be one of the most dominant ways to kill someone (due to the proximity). I wish... it would be such an interesting psychological study to read. Alas, I believe he was simply illustrating a point.