The Sexperiment (1998)

Two sexologists make a bet: that they can induce an inhibited couple to shed their inhibitions by exposing them to a series of interviews with people who recount their erotic adventures. The two "subjects" are told that they are supposed to write summaries of the stories they will hear. The "sexperiment" works: Carson and Dawson overcome their inhibitions, but they discover that they are being manipulated.