Chances are you already know how to "do it," but if you're looking for a little enrichment, why not pick up a copy of Do It Yourself! The Complete Guide to Masturbation? This 2012 book by Stephan Niederwieser (who also wrote such classics as The Complete Guide to Anal Sex for Men and The Complete Guide to Fisthing) provides some interesting and handy tips (like what we did there?) to take your self-pleasuring to a whole new level. Hey, a well-educated guy is always sexy! Available via Giovanni's Room.