Men have been complaining about failed erections ever since Ovid, but as University of Victoria historian McLaren (Sexual Blackmail: A Modern History
) shows, their significance, and with it our conceptions of masculinity, have changed over the centuries. In the medieval world, for example, the primary concern was with whether a man was capable of consummating his marriage; it would take centuries for the physical and psychological causes to take center stage. And though everything from excessive masturbation to coitus interruptus was put forth as an explanation, just about every era, from the ancient Greeks to modern antifeminists, has found some way to put the blame on women. (In the 19th century, doctors claimed men could be put off not just by women who were reluctant but those who were too eager.) After considering the early 20th-century "quack" remedies of gland injections and vacuum pumps, McLaren devotes his final chapter to the cultural changes wrought by Viagra and other drugs created to treat "erectile dysfunction." Far from eliminating the fear of impotence, he suggests such medications may actually lead to more anxiety, as pharmaceutical companies attempt to convince men that sexual activity is vital to their well-being. Perhaps one day McLaren will write about those problems with the wide-ranging verve of this lively history. 8 illus. (Apr.)