There are three Major Arcana cards that routinely tend to provoke quite the freakout: Death (dun dun dun!), The Tower (a rather unwelcome shock), and The Devil. He's usually depicted in very grotesque form and it's a natural response to recoil from such nasties. Case in point, here is an image from a very early deck, the question of what on God's green earth could possibly seduce anyone to be chained to such an ugly thing? Take a gander at the
Sometimes the Devil comes up in readings as advice which doesn't mean tarot is recommending you take a trip down to the neighborhood crack house but instead advises a bit of indulgence in some material comforts (Hi, Ben & Jerry) while recognizing their inherent addictive potential, so you don't OVERindulge to the point of irresponsibility to yourself or others. Instead, it's affirming that yes, sex is good, money is good, chocolate is very good, just keep your wits about you. Please. Else you end up back at The Fool and his ass doesn't look nearly as good as this guy's. You have been warned.