This investigation examines the sociocultural influences on risk of first s
ex among a representative sample of Hispanic (primarily of Mexican origin)
teens living in Los Angeles County. Teen acculturation (measured as languag
e of interview) moderates the effects of gender on risk of sex, with less a
cculturated teens exhibiting the greatest gender difference. Teens living w
ith both biological parents have significantly lower risk of sex and the ef
fect of family acculturation (measured as generational status) operates thr
ough teens' language of interview. Neither measure of parent-youth relation
ship (socioemotional support, parental control) is significant. Hispanic te
ens living in low-density Hispanic neighborhoods have significantly higher
risk of sex than do teens living in neighborhoods with higher levels of amb
ient hazards. The results highlight the importance of characterizing socioc
ultural influences at multiple levels of aggregation.