A
latest research says that pupil dilation can determine sexual orientation. A
Cornell University study has determined that sexual orientation can be revealed
by pupil dilation.
Investigators
believe the findings suggest a noninvasive and nonthreatening method to
determine sexual preference.
In
the study, researchers used a specialized infrared lens to measure pupillary
changes to participants watching erotic videos. Investigators discovered pupils
widened most when individuals observed videos of people who participants found
attractive, thereby revealing where they were on the sexual spectrum from
heterosexual to homosexual.
Previous
research explored these mechanisms either by simply asking people about their
sexuality, or by using physiological measures such as assessing their genital
arousal.
These
methods, however, have significant limitations.
“We
wanted to find an alternative measure that would be an automatic indication of
sexual orientation, but without being as invasive as previous measures.
Pupillary responses are exactly that,” said Gerulf Rieger, Ph.D., lead
author and research fellow at Cornell.
“With
this new technology we are able to explore sexual orientation of people who
would never participate in a study on genital arousal, such as people from
traditional cultures. This will give us a much better understanding how
sexuality is expressed across the planet.”
Experts
say the new Cornell study adds considerably more to the field of sexuality
research than merely a novel measure.
As
expected, heterosexual men showed strong pupillary responses to sexual videos
of women, and little to men; heterosexual women, however, showed pupillary
responses to both sexes. This result confirms previous research suggesting that
women have a very different type of sexuality than men.
Investigators
say the new study also fuels a long-lasting debate on male bisexuality.
Previous
notions were that most bisexual men do not base their sexual identity on their
physiological sexual arousal but on romantic and identity issues. Contrary to
this claim, bisexual men in the new study showed substantial pupil dilations to
sexual videos of both men and women.
“We
can now finally argue that a flexible sexual desire is not simply restricted to
women – some men have it, too, and it is reflected in their pupils,” said Ritch
C. Savin-Williams, Ph.D., co-author and professor in Human Development at
Cornell.
“In
fact, not even a division into ‘straight,’ ‘bi,’ and ‘gay’ tells the full
story. Men who identity as ‘mostly straight’ really exist both in their
identity and their pupil response; they are more aroused to males than straight
men, but much less so than both bisexual and gay men,” Savin-Williams said.
Researchers
believe the new method to determine sexual orientation will advance scientific
knowledge on a range of sexualities ignored in previous research.
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