Researchers from the University of

Researchers from the University of Chicago conducted two studies on a group of heterosexual undergrads. In the first study, participants looked at a set of 120 photographs of couples and were asked if the photos elicited feelings of romantic love or sexual desire. Sexual desire was defined as an increase in sexual thoughts and fantasies toward a target, whereas love was defined as a sentimental and tender state that made participants long for a union.