The present study was conducted to determine sex differences in physical factors (facial attractiveness, physique attractiveness and height) of mate selection with regard to the variable of subject's physical characteristics. A checklist meant for measuring physical factors of mate selection was administered on 75 male and 75 female post-graduate students of A. M. U., Aligarh. The main findings of the study were: 1. Male and Female subjects with respect to their level of facial attractiveness showed significantly higher liking for the high attractive and medium attractive mates respectively. 2. Significant differences were not found to exist between male and female subjects' preferences for the pyknic mates and between athletic male and athletic female subjects' preferences for the athletic and pyknic mates. 3. Tall-height mates and medium-height mates were significantly more preferred by the female and male subjects with respect to their height.