Short. Long. Thick. Thin. Straight. Curved. Up. Down. Do you ever wish your guy's "best friend" came with an instruction manual? With Penis Genius, the few inches below your man's belt will be the topic of the most intimate geography class you will ever take. Filled with trivia, "job" tips, techniques and the answers to penis secrets every girl wants to know including "Is semen really good for my hair and skin?" and "Does a circumcised penis feel more sensation?", this book will score you PLENTY of extra credit with your guy.