Yes, I've heard this a number of times about number ones. The question is of course: Is it true? Or is it just a slightly well established myth? I guess if it is true, it would be a fair statement that it is only sterile while inside the bladder; considering it consists largely of nitrates and.....stuff....which make a nice culture for outside bacteria to grow in. Any qualified people to answer this, apart from the obviously inspired guessers? If you're not qualified, I'd anyway like to hear from you where and when you've come across this rumour/truth yourself.