10 Crazy Contraceptives from History

Really, it's just meant to be a refreshing beverage. © Irina Tischenko/Hemera/Thinkstock

Douching to prevent pregnancy was a big deal for ancient Roman and Greek women, and the method carried on even in our modern society (albeit with a more carbonated twist). Enter the Coca-Cola douche, popular during the 1950s and 1960s for its glass bottle packaging and "shake and shoot" method.

Surprisingly, in 2008 it was discovered there is some truth to the urban legend: Coca-Cola actually does kill sperm -- the best results were achieved with Diet Coke formulations. Coke made with sugar will kill sperm well enough in a test tube, but in vivo it can't kill sperm fast enough, allowing enough sperm through to be a sketchy contraceptive choice (and that's not including the potential health problems introduced when you put soft drinks in your vagina) [source: Anderson].