The "callus-thenics" of touching.
D000293:Adolescent; D000328:Adult; D004192:Discrimination, Psychological / Q000502:physiology; D005260:Female; D005385:Fingers / Q000502:physiology; D006801:Humans; D007600:Judgment; D008297:Male; D012879:Skin Physiological Phenomena; D014110:Touch / Q000502:physiology