From Dating to Sex

By: Kaestle, Christine E., and Carolyn Tucker Halpern.

These researchers study data from the National Longitudinal Study of Adolescent Health and find that the odds of opposite-sex adolescent couples having sexual intercourse decreases by 44% to 75% if the reporting male adolescent lives with two biological parents and by 7% to 56% if the reporting female adolescent lives with two biological parents.

Sexual activity among adolescents in romantic relationships with friends, acquaintances, or strangers.Archives of Pediatric and Adolescent Medicine 159 (9): 849-53.