A confidential 50-item questionnaire administered in 1984 provided data on the sexual and contraceptive behavior of 200 male and 250 female students aged 15-20 years in a post-secondary school near Montreal. The average age of respondents was 1801 years. 89.1% lived with 1 or both parents. Most students were of middle of privileged status based based on family income and parental educational attainment. 3% of the male and 9% of the female students were married. 58.3% of the students had had intercourse, compared to 48.2% in a similar survey in 1976. The average age at 1st intercourse was 16.5 years in 1984 and 17.3 in 1976. 23.8% of the male and 48.3% of the female students were disappointed in their 1st intercourse. 51% of male and 57% of female students used contraception at their 1st intercourse. The proportion using contraception at 1st coitus increased from 48.4% in 1976 to 54% in 1984. 64.4% began to use contraception within 1-3 months of the 1st coitus, 10.4% did so within 4-6 months , 7.4% did so within 7-12 months, and 17.8% did so over 12 months later. The proportion of contraceptive users who used pills declined from 73.2% in 1976 to 70% in 1984, the proportion using condoms increased from 14.5% to 19.7%, and the proportion using natural methods increased from 1% to 3.4%. 9% of female students had used the morning after pill. 4.6% of the women in 1976 and 3.3% in 1984 had had an abortion. 58% of female students and 55% of male students had favorable attitudes toward abortion, 36% had favorable attitudes under some circumstances, and 7% had unfavorable attitudes. The female students were better informed than the male about the first day of the menstrual cycle and the fertile period. The students desired more information about the Psychology of sexuality, sexually transmitted diseases, and contraception.