Remember the concept of “porn buddy” as introduced on the UK show Coupling? You exchange keys with your most trusted friend, so in the event that you die an unexpected death, he (or she) would come over and take away all your porn so your family won’t find it when going through your stuff. This backup service Cucku is similar to that, except instead of taking away your porn when you die, your porn buddy keeps it safe for you while you’re still alive. Which is probably even better.