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“Physically, men and women are generally attracted to each other because of their differences. Ask any group of men from any culture to assess the attractiveness of a female, and they will tend to opt for the figure which curves where they are flat, is soft where they are strong and — though this may be a matter for aesthetic as much as scientific debate — swells where they are narrow. The same, in reverse, is true of women, who will tend to express a preference for men with broad shoulders tapering to narrow hips. … Yet in every other respect, we expect the sexes to be attracted to each other because of their similarities. Any computer-dating questionnaire will try to match intellectual like with like. —Brain Sex