What do people really mean by "open minded" in their profiles?

What does "open minded" really mean? I see it all the time in profiles. I would think that since we're all here becuase we're nudists, we'd be at least open minded about our clothing choice. How 'bout a profile that states "We're an open minded couple looking for outher couples, but we're not swingers"? What does THAT mean? I must be a very confuesd soul...