I agree that you need to mention it. It is not unlikely that kids will look at the pictures on Daddy's camera. And that could be seriously warping to those 2 inquisitive minds. I woulds say, "Were those pictures for me? Did you think I needed to see pictures of your d*** so I would think of what i was missing?!" And before he comes back with his "it's all your fault that I'm so messed up!", you just say, "Erase those pictures on your camera!"
