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By Jennifer Abbasi August 08, Cornell University researchers used porn and measures of pupil dilation to study arousal in straight-, gay- and bisexual-identifying men and women, reports a study published April 3 in PLoS ONE. Human development experts Gerulf Rieger and Ritch Savin-Williams measured pupil dilation in people as they watched two second videos — one of a woman masturbating and one of a man — as well as a 1-minute clip of a neutral landscape that served as a palate-cleanser and a control between the porn clips. Participants in a pilot study chose the clips based on the attractiveness of the models, and the order they were shown in man first versus woman first was selected randomly during the dilation study. On average, heterosexual women dilated more to images of a man than to a landscape, but they also responded more strongly to images of a woman masturbating compared to heterosexual men watching a man. Lesbians and bisexual women in the study more closely followed the male patterns.
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Think You Are Gay? It Shows in Your Eyes, According to Study

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What Our Eyes Say About Our Sexual Preferences

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For the first time, researchers at Cornell University have used a specialized infrared lens to measure pupillary changes while subjects watched erotic videos to determine which gender they found attractive. The results of the study were published Aug. In most cases, a person's stated sexual orientation matched the dilation of their pupils, which show signs of arousal.
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