The best way to learn how to achieve the world's greatest orgasm? Take a class on the Upper East Side! The Pleasure Chest's "Ultimate O: Finding & Expanding Your Orgasm" is a free two-hour course to show you techniques for expanding your orgasm solo or with a partner, how masturbation can help you expand your orgasm as well as on-site sex specialists’ ready to share their favorite tips and toys. Best of all? All attendees enjoy 15 percent off their purchase.