Behavior: Now for the Truth About Americans and Sex

Is there a living, breathing adult who hasn't at times felt the nagging suspicion that in bedrooms across the country, on kitchen tables, in limos and other venues too scintillating to mention, other folks are having more sex, livelier sex, better sex? Maybe even that quiet couple right next door is having more fun in bed, and more often. Such thoughts spring, no doubt, from a primal anxiety deep within the human psyche. It has probably haunted men and women since the serpent pointed Eve toward the forbidden fruit and urged her to get with the program.

Still, it's hard to...