I agree with uglydog 100% if you think for a second that he ain't hearing it at school your in for a rude awakenin. Especially in about two more yrs.
Give him a cell phone for a month, then snatch it up one day and read the txts.
That ain't no joke been coaching and teaching for 20yrs. It is steady getting worse bud. My 10 yr old always asks me questions about that stuff. Don't hide it from them. You ought to hear the questions high school kids ask about things and these are the same kids getting pregnant, smoking, drinking and don't know what it does to them.