What a ridiculous question? Believe it or not, thousands of people have pondered whether Coca-Cola reduces a man's sperm count. Others have pondered whether Coca-Cola works as an ineffective contraceptive.
Being ridiculous does not keep these matters from being studied. Snopes.com has featured a story which can be called Cokelore: Sperm Killer. That story, which cites numerous authorities, found that coca and other sodas are generally ineffective as a contraceptive alternative. Interesting tidbits in the research found varying differences in effects depending upon which coke was used: Diet, Classic, New or Cherry. Pepsi was considered too.
The author suggests that the female, rather than attempting to use Coca-Cola, or any other drink for that matter, as a douche, should wash down a daily dose of birth control pills if she desires to avoid and unwanted pregnancy. In sum the rumor that Coca-Cola is an effective contraceptive has been ruled: FALSE.