Pupil dilation reveals sexual orientation

There is a popular belief that sexual orientation can be revealed by pupil dilation to attractive people, yet until now there was no scientific evidence. For the first time, researchers at Cornell University used a specialised infrared lens to measure papillary changes to participants watching erotic videos, pupils were highly telling: they widen most to videos of people who participants found attractive, thereby revealing were they were on the sexual spectrum from heterosexual to homosexual. Heterosexual men showed strong papillary responses to sexual videos of women, and little to men, heterosexual women, however, showed papillary responses to both sexes. This result confirms previous research suggesting that woman have a very different type of sexuality from men.