This paper reports on a study of teenage sexual activity and pregnancy in Utah, conducted to understand ways of dealing with the State's rising adolescent fertility rate. The paper identifies social and cultural characteristics which distinguish sexually active youth from their abstinent peers. Related research is reviewed and methodology is described: 254 interviews were conducted, including 199 with students randomly drawn from twelve Utah high schools, and 55 with girls who were presently or formerly pregnant. Results are organized under these response categories: (1) response and completion data; (2) intercourse experience, reasons, and age; (3) demographic characteristics; (4) friend, peer, and dating relations; (5) family relations; (6) school background and achievement; (7) religious and responsibility orientations; and (8) sexual education and attitudes. The following section compares the attitudes and experiences of non-sexually active males and females to those of their sexually active peers. Family relations are discussed as one domain where particularly significant differences were found (sexually active girls are said to be more likely to have strained families than sexually active boys). Other important factors are said to be age at initiation of dating; feelings of responsibility to other people and institutions; and the source, age, and effectiveness of sex education. Finally, survey limitations are considered and recommendations, derived from interviews with teachers of young mothers' programs, are offered. Appendices include questionnaires and other materials used in collecting and analyzing data. (KH)