How do they get him?

The characters

 Lisa Smith: 22 years old, 5'10", 135#, 36-24-32.  Long flowing blonde hair, blue eyes. Junior at the University of Wisconsin at Madison.
 Beth Davidson: 24 years old, 5’7”, 129#, 38-24-34. Black. Long black hair, brown hair. Junior at the University of Wisconsin at Madison.
 Sally Kwan: 30 years old, 5’9” 133#, 34-22-32. Japanese. Long silky black hair, black eyes. Medical doctor and professor of pharmaceutical  at the University of Wisconsin at Madison.
 Chris Parker: 18 years old, 5’8”, 165#. Brown hair, brown eyes. High school senior who is captured by Lisa, Beth and Sally while visiting the University of Wisconsin at Madison.