Coke has the ability to inhibit sperm motility and kill sperm in vitro. This is because cola contains high levels of carbonic acid, which can kill sperm. However, there is no evidence to confirm that Coke can have a spermicidal effect when taken orally into the body. Coke, like any other carbonated beverage, is absorbed orally, and its sugar, water and carbohydrates are absorbed by the body and then decomposed. There is no test to confirm that Coke, when taken orally, can damage the spermatogenic epithelium or reduce the quality of semen. There have been medical tests in which semen was placed in cola and sperm viability was reduced and sperm death was observed. However, this is only an in vitro test, not an in vivo test, so there is no scientific basis for cola to kill sperm. It is only customary to say that cola has a spermicidal effect, probably based on the results of the in vitro test and extrapolated to the results of the in vivo test.