Gay women tend to be exclusively sexually attracted to women, while straight women are more likely to be aroused by both sexes, a study says. Researchers asked women about their sexual preferences and compared these with their arousal levels when shown videos of attractive men and women. The University of Essex study concluded that no woman is "totally straight". The new study, led by Dr Gerulf Rieger from the University of Essex and published in the Journal of Personality and Social Psychology , measured the arousal of women using eye tracking devices and direct measures of physiological sexual response. Previous studies had already suggested that straight women were aroused by both sexes when tested, but researchers had never looked at whether the same was true for gay women.