Instruct: Classify Amazon reviews into positive or negative sentiment
Query: If you don't know this, you ought to

"Body Language Secrets" is a useful guide to body language (BL), especially in the context of dating relationships. Steele suggests practicing reading BL by watching couples in restaurants. I've tried it watching TV shows like Blind Date, and I can see many of the gestures that Steele describes. Unlike some of the author's other books, this one is oriented almost equally toward men and women. The book also adds some good advice on other aspects of dating relationships, like "What to Talk About" and "Courtship Tactics". If you're not sure about buying this or any of Steele's many other books, you can check out his web site, and his web radio show on live365, which have a cornucopia of information on his dating perspectives.