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I think they believe that doing it in the 'prone' position is harmful. I wouldn't worry, but dont do it too often.
The odds are you won't suffer damage from this. I have researched this since my boyfriend does the same thing, but he definitely hasn't suffered any ill effects after 28 years!
The damage is rare and it is not permanently disfiguring. If you are really concerned, try other approaches, like in the shower, or lying on your back.
Check with a doctor about this if you experience any pain or numbness.
You shouldn't worry at all...nothing wrong with rubbing it on the bed. Just avoid putting it in things where it might get stuck...like the top of a bottle. Otherwise, do what you fancy. Good luck.
Just be careful not to braise the skin, cause then it will sting. The only problem with the bed scenario is the fact that you can soil the sheets.
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