Continue to have open conversations about Sex, Consent, Respect, Drugs, and Alcohol. Let him know that he can always come to me to talk, for information, or for problems. Put a box in bathroom with note, “This box on me, anything more you need to save and prepare.”, so that he continues to understands that this is a responsibility.

I'd be glad he's being safe and say nothing, but I'd also check his wallet to make sure he isn't storing one there. I did in high school and college and ended up being lucky they never wore out