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The pupil expands when going from light to dark and also when looking at someone you love. Could it be that the appropriate conditions would be going from the bright outdoors into the dark (maybe the "tunnel of love"?) with someone you love?
Or maybe when someone strokes and "blows a pupil"? (sorry, that's kind of sick).
betts
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Name the organ of the human body, which
under the appropriate conditions, expands to six times its
normal size, and define the conditions."