"They've been touted to increase sex drive, boost arousal, and put men and women in the 'mood' for hundreds of years. But the skeptical consider aphrodisiacs -- foods, drinks, and ... extracts and supplements -- to be more mental than physical. A brief look at some ... of these purported libido enhancers reveals both flimsy claims and some sound science." Covers watermelon, oysters, hot peppers, and chocolate. From U.S. News & World Report.