We created supermale and superfemale images, respectively, by exaggerating how the male average differed from the female average, and how the female average differed from the male average (details below).
The supermale and superfemale faces were created by distorting (warping) the grey-level map of each average into a new configuration that exaggerated how that image differed from the opposite-sex average (see Rhodes, Byatt, Tremewan, & Kennedy, 1997, for details).
Each participant was shown a pair of images containing the average male and the supermale, and a pair containing the average female and the superfemale. For each pair they were asked to choose the more attractive face.
The proportion of participants choosing the supermale or superfemale face as more attractive was calculated separately for male and female faces and participants (see Table 1).