It was pretty easy.... What WASN'T so easy was his friend who I drop off up the roads comments. He announced in the car "And we learnt you can have sex with more than one person. I knew that anyway, but it was good to really know." My boy seemed genuinely baffled with this and said "Can you?" The friend said "Yes, people that do that are called "players". They have sex with all the good looking women. They go to strip clubs and bars and that's why they're called "players"" Pretty sure that bit wasn't part of the lesson!. When I dropped the friend off, I had a casual chat with my boy and said the bit about players was kind of true but it was probably best just to have one partner at a time and have sex with someone you really cared about. Kept it all light and casual.
I think this is a good age because they are being taught, hopefully before they start tripping up on stuff on the internet. If they can learn that sex is part of a loving relationship before being exposed to internet porn, it might make them stop, look, and realise that isn't the real world on the computer, sure porn can play a part IN a loving relationship, but a relationship is better than staring at a computer screen on your own, if that actually makes any sense at all.
In second grade, I got a call that my son and three other boys were called to the principal's office for discussing 'the facts of life' with a little girl in their class. Her parents were understandably concerned (don't blame them a bit). Knowing that we'd only covered the most basic basics with our son, I was curious what they said; Josh said 'Troy' had informed all of them, then got embarrassed & wouldn't talk about it any more. When BH got home, I sent him down to son's room to find out what Troy told them & clear up any mistakes. He comes back up after a few minutes, shaking his head: "Troy is very well informed. I didn't know that much until Jr High."