I have the unfunny answer! We bought a house from an old couple. There are smoke detectors in all the bedrooms, because one of them was on oxygen.
My wife and I need a new bed, we pretty much just have a matress and box spring sitting on a metal frame.
I'm a drafter by trade. So I designed us a new bed, a sturdy one. It will have four posts, and it will have recessed tie downs built into it. The foot board will double as a set of stocks, and best of all the matress will be at just the right height.
And I learned that I shouldn't design bedroom furniture while horny.
They are required in bedrooms in California if the place was built after 1992.
Edit: Smoke alarms not sex swings
Which in my apartment is annoying as hell; the one in the hall is less than a foot from the one in my bedroom. If one goes off when cooking, the other one goes off too. Redundancy is good but maybe put the one in the bedroom somewhere other than right above the door?