This idea, the effect that punishment can improve performance, was what participants thought they were testing in Milgram's famous learning and punishment experiment that you've probably heard about if you're a psychology student.
U svakoj su kulturi muškarci preferirali žene  mlađe od njih u prosjeku od 2.66 godina, ako se ne varam, a u svakoj su kulturi žene preferirale muškarce starije od njih