No one is 100% straight, according to new research out of Columbia University. The findings suggest that sexuality is much more complex than just gay or straight. It also backs previously held beliefs on sexuality from thinkers like Alfred Kinsey who suggest that sexuality is on a sliding scale. To conduct this research at the Sex and Gender Lab, Department of Human Development at Cornell University, participants were subjected to porn. The researches look at the amount of eye dilation (a less invasive way of checking arousal than observing genitals).

“You can’t control your eye dilation. Essentially, that’s what the whole project attempts to get at, another way of assessing sexuality without relying on self report,” Ritch Savin-Williams, the director said.

“We show straight men a picture of a woman masturbating and they respond just like a straight guy, but then you also show them a guy masturbating and their eyes dilate a little bit,” said Savin-Williams. “So we’re actually able to show physiologically that all guys are not either gay, straight, or bi.”