Wanna get even better here..
About 1st/2nd grade I walked in on my folks.
I did not know what "Sex" was exactly yet but Mom and Dad were "Naked" and holy crap I walked in.
Now I was vwry young then they did not exactly wanna tell me the "Truth".
This went on afew Months too and later My Dad borrowed my Uncles Boat we went Fishing.
He explained to me that Mom & Dad get "Naked" lay on the bed & thats what "Grown" People do.