Erika Kokkinos felt like a monkey in a zoo.
Technically, she was "dating." At each of 12 tables at an art gallery in Northwestern University's student union, Kokkinos was meeting an eligible college bachelor, some of them quite attractive. But the radio/television/film major had trouble disregarding the tripod-mounted cameras and cucumber--sized microphones. Barely an hour before, she had produced a saliva sample-not exactly a sexy exercise--so researchers could analyze her hormone levels. The whole evening of romantic possibility had been set up as a science experiment.