A plate from Salvador Dali's erotic work, Treatise of erotic systems and the thousand masturbatory ways from the Romans to Dali.
Hmm... nope, it's not turning me on. And let's face it, most things do. Bloody surrealists.
(Oh, all right, I'm being silly - there's an accompanying plate incorporating all these inoffensive illustrations into a grotesque and filthy assemblage, but I can't publish it here!)