Adam, M., McGuire, J., Walsh, M., Basta, J., & LeCroy, C. (2005). Archives of Pediatric and Adolescent Medicine, 159, 261-265.

Synopsis
Hispanic teenagers living in Arizona who speak primarily English are more than twice as likely to report being sexually active as Hispanic teenagers in the state who speak primarily Spanish, according to a study published in the March issue of Archives of Pediatrics & Adolescent Medicine, the Houston Chronicle reports.

Dr. Mary Adam, a pediatrics researcher at the University of Arizona College of Medicine, and colleagues surveyed 7,270 white and Hispanic Arizona teenagers in grades seven through 12, all of whom were involved in the Arizona Abstinence-Only Education Program (Berger, Houston Chronicle, 3/8).

The survey aimed to predict the probability of the onset of sexual activity based on students' age, sex, family structure, religiosity, free school lunch participation, grades, rural residence, acculturation and ethnicity and the location of the abstinence-only sex education program, with special attention paid to the influence of Hispanic teens' acculturation into U.S. culture, as defined by primary language spoken (Adam et al., Archives of Pediatrics & Adolescent Medicine, 3/1).

According to the study, 30.7% of Hispanic teenagers who reported speaking primarily English reported having had sex, compared with 13.6% of Spanish-speaking Hispanic teens and 24.4% of Hispanic teens who reported speaking English and Spanish with equal frequency. Approximately 24.4% of white teens reported being sexually active, according to the study.

Source
http://www.kaisernetwork.org/daily_reports/rep_index.cfm?DR_ID=28534