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Casual sex has long been portrayed as a societal sin. Dr. Vrangalova, a renowned sex researcher, weighs in on the topic. Zhana Vrangalova is a sex researcher who studies how various expressions of sexuality (particularly casual sex, promiscuity, and nonheterosexuality) are related to psychological health and wellbeing. She holds a Ph.D. in Developmental Psychology from Cornell University. She is currently an adjunct instructor at New York University This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at http://ted.com/tedx