a little anecdote:
Luke loves watching Discovery shows with Cameron in the morning before Cameron leaves for work. The other day, they were watching a nature-ish show that included the obligatory authentically naked indigenous people. Since this is Discovery, they courteously blurred out the men's unmentionables as they walked around in the rainforest. After watching for a while, Luke, always trying to figure things out, calmly asks Cameron, "Dad, do those guys don't have any privates??" Too funny! . . . I love how little kid's brains work--a perfectly logical conclusion for a 5 year old!