You may have noticed that many young women wear less, and more sexually provocative, clothing in public than they did a generation, or even 10 years, ago. It is easier to notice, however, than to explain. But explaining it is crucial to understanding what has happened to men and women in the last 40 years and where male-female relations are headed. Women exposing their bodies in public is a big deal. Playing with the sex drive, the most powerful force in nature, is far more dangerous than playing with fire. Even if one welcomes this development -- and for the...