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Just learned a fantastic new meaning for PPG.
Tuesday, 22-Jul-14 07:30:28 UTC from web-
@pony My favourite for 'PPG' is penile plethysmograph, it measures male arousal through blood flow.
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@northernnarwhal that's another way of saying the same thing as what I posted. :o
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@northernnarwhal It's all new to me. *shrugpony*
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@northernnarwhal It's possible I've come across it before but forgotten the term. I've heard of it being done I think someplace.
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