The study, based on nearly 700 popular films, found that watching love scenes could "fundamentally influence" a teenager's personality.
The researchers, from Dartmouth College in New Hampshire, concluded youngsters were more prone to take risks in their future relationships.
They also concluded that for every hour of exposure to sexual content on-screen, participants were more than five times more likely to lose their virginity within six years.
"Adolescents who are exposed to more sexual content in movies start having sex at younger ages, have more sexual partners, and are less likely to use condoms with casual sexual partners," said Dr Ross O'Hara, who led the study.
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