"There has recently been controversy over the attributes of old-formula
("Classic') Coke and those of "New Coke.' We therefore compared the
effect of various modern formulations of Coca-Cola on sperm motility."
(Motility basically means the sperm's swimming ability.) The results
were dramatic. "All samples of Coca-Cola markedly reduced sperm
motility, whereas [a saltwater control solution] had no spermicidal
effect." Old Coke was five times as potent as new Coke, and Diet Coke
was the most potent of all, annihilating all in its path. That may give
you pause next time you're tempted to chug down a frosty one.
visit ; Straight Dope.com
http://www.straightdope.com/columns/read/480/can-coca-cola-be-used-as-a-c
ontraceptive
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Karma, What a concept!