5 year old boy o curiosity

Hannah🇬🇧

So I need some advice, I have a 5 year old son who has always loved his penis 😂 but he’s also been very curious about others private’s. When he was 3 I caught him trying to lift up a girls skirt at childminders (his granny) where he was told about respecting others private’s. Last year when he was 4 I heard him asking to see his cousins penis whilst also showing off his! Again I told him about keep private’s just that private. Well yesterday at child minders he was caught showing his winky off and he was asking the girl to show her area which she did!

Is this normal behaviour?! I’m starting to panic