My child is about to turn 18, so our conversations started a long time ago now, but I absolutely agree it’s a subject that will be long running. Being prepared for continuing and revisiting chats about sex and relationships is very important in my opinion. I also think you need to consider opening up your advice to include any sexual partner, as limiting discussion of a practical (as opposed to emotional) nature might mean that your son is still ill prepared, if information on sex with a woman turns out to be irrelevant.