Spermicides are birth control medicines that kill sperm by impairing their ability to reach an egg. They come in many forms, such as cream, foam, jelly, suppository, or film, and are placed deep inside the vagina before sex. Spermicides alone are one of the least effective forms of contraception against pregnancy, with a success rate of about 70% . They do not protect against sexually transmitted infections (STIs) or human immunodeficiency virus (HIV) .
There is no scientifically proven way to remove semen from the cervix once it has entered through the vaginal canal. Some people may try to remove semen by urinating, showering, bathing, or using vinegar, but these methods are unlikely to work. Urinating after sex does not flush out sperm from the vagina, and showering, douching, or bathing will not reach the semen in the uterus. Inserting vinegar into the vagina may lead to irritation, and there is no scientific evidence to prove that it kills sperm.
Factors that can kill or reduce sperm count include excessive heat, tight underwear, and ingesting certain chemicals. Sitting in a hot tub or sauna, wearing tight underwear, or placing a laptop directly on the lap can generate heat that kills sperm or decreases sperm count. Smoking and anabolic steroids can also damage sperm and lower sperm production.
