I don't think there IS a difference - except possibly that a dong is lifelike and a dildo isn't necessarily..... but I think it's one of those cases where the difference is so insignificant the words are used interchangeably...

O' course, I could be wrong.... first time for everything!

CasperTG

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You know, Blackadder, for me socks are like sex. Tons of it about and I never seem to get any.

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https://imgur.com/a/80hiRdm