Skip the health class on “penis sensitivity training” day? Here’s a recap of what you should’ve learned the, well, the soft way (oh, behave!): The libido can be influenced by the power of suggestion. The force can sway a man’s sexual confidence toward the light or the dark side. Unfortunately, you scare your own one-eyed monster back into his fleshy cage. Don’t worry though, and don’t think less of your coital skills because of this incident. The cliché says it all: it happens to every guy on occasion.