Chara PJ, Kuennen LM (February 1994). «Diverging gender attitudes regarding casual sex: a cross-sectional study». Psychol Rep74 (1): 57–8. PMID8153236. «Abstract: Students at five educational levels ranging from seventh graders to college seniors were surveyed regarding their attitudes about the acceptability of casual sex. A striking developmental contrast was found: males became increasingly accepting of casual sex; females were consistently opposed to casual sex at all educational levels.».