IANAG (I Am Not A Guy), so I can't really speak to whether and/or when boys have the plastic protective covers removed from their beds.
Fortunately, I know just the person to ask!
@MassGuy.
You're no doubt going to be able to speak to this.
When did your mom remove the pee-pee protector from your bed?
I'm sorry, I just realized, I shouldn't assume anything.
IF the cover has in fact been removed from your bed now, how old were you when was it taken off?
And whatever the answer, just remember: No shame.
Accidents happen.
TIA.
JMO.