The study, published in Psychological Science, a journal of the Association for Psychological Science, said roughly 85 percent of movies released from 1950 to 2006 contained sexual content, and only 9 percent of sexual content in movies contained messages promoting sexual health. Sexual explicitness of PG-13-rated and R-rated movies has increased over the past decade, researchers also said. Evidence suggests that adolescents' sexual attitudes and behavior are influenced more by movies than by other forms of media, the study said.