There was more in Dunham's book than "play'n doctor".How? Kids are naturally curious, and according to her account she was just a curious kid, as you mentioned, basically "playing doctor." Kids do those things, they think nothing of it, to them there is literally nothing sexual going on, and when it happens, oh well. Children are curious devils, and they are especially curious about their body and the bodies of others, why they look different, what is different, what is the same, and that sort of thing isn't exactly something that a billion-endless "whys" can't satisfy.
When kids do that, it is innocent curiosity - it's actually usually parents who make it into a scene, in a similar way as to how they make a big deal out of seeing their small child touching their genitals, even though to the child it is nothing more than exploration and a feel good touch.
What Josh done was abuse. What his parents done should be grounds for them to be deemed unfit parents.
But I ain't go'n into it.
Very creepy gal.