Yes, sometimes bringing attn to the problem makes things worse and then they do it MORE!!
hi..i worked in a daycare for a couple years and i remember we had issues with boys looking up girls dresses, and boys talking about there penis. that behavior is just normal I think. I mean he is only TWO, so it's not like he is perverted or has any problem. I would just explain to him that that the area covered up by underwear is called our private parts and we dont let other people touch our privates. thats what i do with my daughter. but i would not make a big deal out of it because since he is only 2 he may even want to do it more.