There is a need for systematic comparisons and replications of research on questions concerning students' sexual behaviors and attitudes. To examine whether or not students' attitudes and behaviors toward sex and sex-related issues changed over a decade, 435 incoming freshmen in 1973 and 460 freshmen in 1983 were administered an anonymous questionnaire assessing their sexual behaviors and attitudes. Seven major patterns of results were found. These included: (1) an increase in rates of premarital intercourse; (2) a decrease in sex differences in rates of intercourse, with this decrease primarily reflecting increased rates among females; (3) no change in students' personal and sexual codes; (4) a movement toward a more conservative standard for female sexual behavior; (5) a tendency for less awareness of campus resources; (6) a more conservative view of abortion in 1983; and (7) fewer students viewing homosexuality as an illness in 1983, accompanied by less willingness to disclose one's own homosexual preferences. The findings indicate that sexual identity is an important developmental issue for college students. (BL)