The belief that men are more likely to get turned on by sexual images than women may be something of a fantasy, according to a study suggesting brains respond to such images the same way regardless of biological sex. Writing in the Proceedings of the National Academy of Sciences , Noori and his colleagues report how they came to their conclusions by analysing the results of 61 published studies involving adults of different biological sex and sexual orientation. The subjects were shown everyday images of people as well as erotic images while they lay inside a brain-scanning machine. Noori said all participants rated the sexual images as arousing before being scanned. Previously studies based on self-reporting have suggested men are more aroused by images than women, and it has been proposed that these differences could be down to the way the brain processes the stimuli — but studies have returned different results. Now, looking at the whole body of research, Noori and his colleagues say they have found little sign of functional differences.