 Sexual over-perception relative to under-perception was reported more frequently among younger participants, among singles, and among participants with an unrestricted socio-sexual orientation.Endorsing and being more open to casual sex may have evoked more sexual interest from members of the opposite sex, leading to more frequent reports of sexual overperception.Socially unrestricted male and female high school students were found to report being more subject to sexual harassment as well as sexually harassing others.