The 'roving eye' effect is the propensity of people in relationships to 'eye up' members of the opposite sex. I took 20 men and tted them with incredibly sophisticated glasses that could track their eye movements and record both the movement and the object being observed {this is the point at which it should be apparent that I'm making it up as | go along). Over four different nights I plied these poor souls with 1 , 2, 3 or 4 pints of strong lager in a nightclub. Each night I measured howr many different women they eyed up [a woman was categorized as having been eyed up if the man's eye moved from her head to her toe and back up again}. The data are in the le RovingEyesam Analyse them with a oneway AN OVA. (2}