TO UNDERLINE HIS theory that sexuality is a construct of human discourse, the philosopher Michel Foucault noted that people talk about sex a lot. "We convince ourselves that we have never said enough on the subject," he wrote in his (four-volume) "The History of Sexuality". "It is possible that where sex is concerned, the most long-winded, the most impatient of societies is our own." After a three-hour discussion of sex and dating with 30 students at Northwestern University, on the rainy shore of Lake Michigan, your columnist felt he knew why. Few fields of human behaviour—and none more important—are so hard to explain.
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