Coca-Cola

According to various myths, Coca-Cola is a reliable contraceptive: in the early 20^th century, this carbonated beverage was sometimes employed immediately after intercourse to rinse the vagina.

Teenagers violently shook the unsuspicious bottles, or those of other brands, before using them as a kind of douche. This lasted into the 1950s.

As can be imagined, this application was impractical and wholly ineffective. Studies have shown that neither Coca-Cola, Diet Coke, Pepsi nor other, similar products have any kind of negative effect on sperm.