According to a study conducted at SUNY Albany, women's voices are perceived to be more attractive or sexy when they are at their peak monthly fertility. Researchers recorded women voices at four periods during their menstrual cycle. The recordings were then replayed to students who were asked to rate the voices based on attractiveness. Males and females both rated the voices most attractive when recorded during the peak fertile period of the subject's cycle. The results can been interpreted as supporting the controversial view that human females indeed experience oestrus as do other female mammals, albeit in more subtle ways. Prior studies have also shown that women's attractiveness increases during peak fertility periods as one study showed female lap dancers earned greater tips during fertile days.