Andrew is a teenager in a dating relationship. He and his girlfriend spend time together on the weekends. They often use alcohol and drugs, and also have unprotected sex.
Which of these puts Andrew at the greatest risk of contracting an STI? Check all that apply.
A. He is a male.
B. He has unprotected sex.
C. He is in a dating relationship.
D. He uses drugs and alcohol.
E. He spends weekends with his girlfriend.