ATV out playing without me again

Once again my ATV has been getting up and going places without me on it. I can see that I am going to have to initiate a hard and fast rule this summer that the ATV is off limits and no one can ride it unless they specifically ask my permission before they go anywhere near it. My trouble is that I am a softie and an easy pushover, always have been, but I am going to need to put my foot down on this. If I ride it the thing will last me for many many years, those other people seem to go through ATVs at a rate of 1 to 4 a summer.