First dates are awkward enough, but 20 or more of them in a single night? On the discomfort scale, I imagine it would rank somewhere next to getting a bikini wax and having a cavity filled without sedation, simultaneously. From a geezer perspective and to minimize the talking and mingling, I think a far better event would be the same three minute format substituting speed dating for speed sex. I know I do that well, or so I'm told.
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If you must choose between two evils, pick the one you've never tried before.