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"So if a man says he's straight, his eyes are dilating towards women," Savin-Williams told Live Science."And the opposite with gay men, their eyes are dilating to men." The eyes have it The link between pupil size and arousal goes way back.

Stephanie Pappas is a contributing writer for Live Science.These volunteers watched separate one-minute videos of a man masturbating, a woman masturbating and neutral landscape scenes.The videos were all matched for brightness so that differences in light wouldn't skew the results.You can get chlamydia by having vaginal, anal, or oral sex with someone who has chlamydia.If your sex partner is male you can still get chlamydia even if he does not ejaculate (cum).Whether you're gay, straight or somewhere else on the spectrum, the truth of who attracts you could be in your eyes.

Pupil dilation is an accurate indicator of sexual orientation, a new study finds.

Simply asking people if a given stimulus turns them on or not is equally problematic, as people may be ashamed to admit their desires or even deny them to themselves.

It's also difficult to ask direct questions about sexual orientation in many cultures, Savin-Williams said.

Gay women show more pupil dilation to images of other women, similar to the pattern seen in straight men.

But straight women dilate basically equally in response to erotic images of both sexes, despite reporting feelings of arousal for men and not women.

Basic Fact Sheet | Detailed Version Basic fact sheets are presented in plain language for individuals with general questions about sexually transmitted diseases.