Oooh, so creepy! And so rightfully Lex! I love that he knows he's a psychopath, but that the diagnosis is so beneath him that his defects are everyone else's problem. And so cool that he's imbibing in the pheromone spray in order to be able to feel something. I've seen it suggested that Miranda hit him with the permanent, 100% strength solution, but this was a neat twist on that idea. Nicely done!
Good grief that explains a great deal about Lex's actions after that particular episode. 