They don’t like to discuss this in school. If they even touch on the subject it is usually in the latter years of high school. I spoke to my son about sex, what can happen and even how to use a condom (on a banana) from the time he hit puberty. Kids are becoming more sexually active much earlier than in my day and I wanted him to be prepared. I would always ask him if he needed a condom every time we went to the store. He was embarrassed and shy, but at least I imprinted it in his head. We kept an open dialogue about sex and I told him to use his hand until he found someone that he really liked. Sure he was a bit uncomfortable, but I was very proud of him when he did finally get into a longer relationship and told me “ Dad don’t worry, I used a condom “. I just smiled and said good job.
If you have kids you must educate them about sex yourselves. You certainly can’t depend on the school, or their friends.