My two grandson ages 3 and 5, seem preoccupied with displaying themselves to each other, and others, The 2 year old wants to touch the older boy whenever the chance allows, dressing, bathing ect. Also the 2 yrs old will place objects, fingers, toys ect, in/around his rectum. Discussed the private parts subject, and asked where these ideas were coming from. They state "they just thought of them" Also think it is funny, after repeated attempts, of trying to convey that this is private, and shouldnt be exhibited to others. Is this beyond normal curiosity at this age.?