Mish...my family too!!! And we didn't have a health class that taught sex ed. I had no idea what VD was...and one time in the 7th grade the teacher was talking about rape, and I had to raise my hand because I had no idea what it was. It is no wonder I got pregnant when I was 16!!!
For your son, CONDOMS. Open it with that. Tell him this is a hard talk but one you feel you should have because you are looking out for his safety. The chances are that he knows most of it already, but hearing it from a parent is always a plus. Safe sex, abstinance, I think I told my girls that if they decided to have sex I would much rather them come to me for birth control rather than have unprotected sex. D23 did...when she was 15 and as much as I didn't like it, I also knew she was going to do it anyway and so I made sure she was on the pill and had condoms.
Is it better to talk about waiting? Absolutely...but realistically it is better to be prepared either way.
Im still standin better than I ever did looking like a true survivor feeling like a little kid Im still standin after all this time and Im picking up the pieces of my life without you on my mind..