This article is a revision of a 1983 position paper of the Society for Adolescent Medicine with inclusion of the newest medical advances in research on adolescent sexuality; i.e., contraceptive compliance, promotion of behavior change, relationships of ethnicity and pregnancy, and male reproductive health. The issues for the 1990's will be sexually transmitted diseases' morbidity and mortality. Topics identified are sexual activity and adolescent pregnancy, care of the pregnant teen, sexually transmitted diseases, HIV infection, the male adolescent, sexual abuse in adolescents, gay and lesbian youth, interventions, reproductive health care of adolescents with disabilities and chronic illnesses, and training of primary care physicians. The HIV/AIDS epidemic has focused attention on the reproductive behavior of males. Sexual activity varies by racial/ethnic group. Interventions to delay sexual initiation needs to be examined, although condom use has increased among 17-19 year olds from 21% to 58% in metropolitan areas. However condom use is lowest among the group of men at highest risk of STDs: those who had ever used drugs, those who had ever had sex with a prostitute, and those that had 5 or more partners/year. Male beliefs about contraception have been infrequently examined. There are misconceptions about heterosexual transmission of HIV. Better screening is needed for STD detection. Fathers are more involved in prenatal care and postnatal intervention programs. 7% of children have been subjected to nonvoluntary sexual intercourse between the ages of 18-21. ; i.e., 12.7% of white women, 9% of black women, 1.9% of white males, and 6.1% of black males. Risk factors for white women were living apart form parents at 16 years, poverty, physical and emotional limitations, parental alcohol and smoking and drug use. Sexual assault was associated with hitchhiking and alcohol and drug use in 1 study cited. Physicians need to be sensitive to this issue and probe for information. The sexual needs of those unsure of orientation or who a re homosexual or lesbian are gradually becoming recognized. Among 12th graders. 1% of males and 1% of females viewed themselves as mostly or completely homosexual or lesbian, and 10% were unsure. Psychological and medical problems are encountered. Interventions needed are reproductive and STd information, multiple approaches in a variety of settings, adolescent clinics, and outreach.