like many new concepts the first time was most likely accidental. Its probable that someone was holding one in their hand one summer, and it slipped out and hit the fan.
I wouldn't be surprised if Mythbusters do an episode on SHTF. I can imagine those guys dressed in latex fetish outfits with a fan nearby.
Actually sex shops should sell fans for those broadminded folk. Probably a good idea to get a good quality fan without nasty chemicals just to be safe.
I digress
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