I grew up in an ultra reserved, conservative household. Sex was never discussed. EVER. Yesterday mom saw him stripped down to a tshirt masturbating on his bed. This morning he came into the kitchen, took off his pajama pants and started telling me how shriveled up his penis was. I was completely caught off guard when he pulled down his pull ups. All I could think in that moment to do was redirect him to the bathroom and said the kitchen isn't the place to talk about that. Now that I've calmed down how do my mother and I approach him and what do we say if he starts exposing himself more? This is completely new behaviour.