A Little Privacy Please

Ever since we've moved in the boys do not leave my sight. Wherever I go they go and being the only female in a house of 4 boys I would like some privacy especially in the bathroom where there is no lock on the door (how odd) and the shower doors are clear glass but oh no there is always someone in there, usually all three when I'm showering, using the restroom or getting ready. Today Conner and Sam were jumping off the tub side into the tub while I was in the shower while Mikey was knocking on the shower door. Conner still hasn't asked any questions about the female anatomy but he's getting older. It's just a matter of time. A lock must be installed for my sanity. This is why I want to shower before they even wake up but that hasn't happened yet.