A recent Cornell university research has found that sexual inclinations can be known by optical reflexes.
Pupil dilation has long been known to hold a clue to a person's level of excitement and now they may reveal one's sexual orientation as well.
During the study, 165 men and 160 women who were a mix of straight, gay and bisexual, watched one-minute videos of a man masturbating, a woman masturbating and neutral landscape scenes.
The study showed that the response of participants agreed with their sexual orientation -scientists observed pupil dilation according to their level of excitement on seeing the different images.
Researchers now wish to explore this connection due to perplexing results in the case of women, who appeared to respond in an excited way to sexual images itself ,irrespective of their sexual orientation.