Health-E You Efficacy Trial for Male Adolescents

Inclusion Criteria: * Assigned male sex at birth * Age 13 to 21 years old * English and/or Spanish as preferred language to read, listen, and converse * Self-reported engagement in vaginal and/or anal sex in the past 12 months * Access to phone or internet for follow-up study activities Exclusion Criteria: * Aged 12 or younger or older than 21 * Primary language other than English or Spanish * Not able to provide informed consent * Unable to communicate due to cognitive, mental, language, or other difficulties * Not sexually active, engaged in oral sex only, or more than 12 months have passed since last vaginal and/or anal sex. * Previous participation in a Health-E You study activity or the app