Aiden is 16mnths and I make sure he's in a onesie...I think its a boy thing. He has tried, unsuccesfully, to pull his diaper off and explore

and a few times I have left him without a diaper on, to air him out, only to find him playing with the puddle at his feet

I think this is a stage that all boys go through.
oh and Aiden will go find a diaper and tell us he needs to be changed...only it comes out "da peas" I bet both of ours may train earlier. My now 8 year old never did this at this age.