He thinks its normal!!

I am so beyond annoyed!! We built our first home together, we lived with his parents while it was being built. We've been in the house for a while now, and his parents just show up whenever they feel like it WITHOUT either of us knowing!! They know our garage code and just open our garage and walk in, I've changed it and somehow he fucking tells them every time I change it "because it's rude" do you know how irritating it is that when I want to just have sex in the living room I can't because his parents will probably show up. They don't understand this isn't their home, I would love to have them over but when they are invited or ask if it's okay to swing by! He thinks this is normal and is pissed at me for being up set that I want privacy. We built on many acres far back for the sense of privacy but yet can't get it! I'm finally living on my own in my first home and I can't even enjoy walking around naked because they always show up!!! Ugh