Harry Reis, University of Rochester (image) University of Rochester Caption "'Boy or girl?' is the first question parents are asked about their newborn, and sex persists through life as the most pervasive characteristic used to distinguish categories among humans," says Harry Reis, professor of psychology at the University of Rochester. But a new study shows that women and men, by and large, do not fall into different groups. Credit University of Rochester Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.