Brenda walks by the room of her 4-year-old son, Zach, and sees him and his 4-year-old cousin, Justin, standing, facing each other, with their pants and underpants down. When Brenda asks Zach what’s...

Brenda walks by the room of her 4-year-old son, Zach, and sees him and his 4-year-old cousin, Justin, standing, facing each other, with their pants and underpants down. When Brenda asks Zach what’s going on, Zach grins and replies, “We both wanted to see our things.” Zach’s behavior is: