Families (N = 548) with a seventh- or eighth-grade adolescent were ran
domly assigned to receive either a videotape sex education curriculum
including the videos with mailed newsletters, the videotapes without n
ewsletters, or neither (control group). Home visitors were present in
the homes while parents and teens privately completed self-administere
d surveys Just before, 3 months after, and 1 year after the materials
were distributed. Treatment groups showed the largest increase, relati
ve to the control group, in the frequency of parent-teen communication
regarding sexual topics. Treatment effects subsided during the 9-mont
h period between the posttest and delayed posttest, when the families
no longer had access to the videotapes. No significant effect of the p
rogram was observed on the key outcome variables of teens' sexual inte
ntions or behaviors.