After ejaculating, hold the base of the condom to keep it from coming off and remove the penis from the partner's vagina, anus or mouth. Wrap the condom and dispose of it in the rubbish. Never use a condom twice. Use only water based lubricants. Use condoms within a year or two of the date of manufacture.
Condoms are extremely reliable.
They usually only break when they are fitted incorrectly or there is not enough lubricant. Neither sperm, nor the viruses and bacteria that cause HIV and other sexually transmitted diseases can penetrate an intact latex condom. If your condom does break, withdraw carefully and immediately. If there is any possibility that infection has occured talk to a doctor or clinic about getting tested. If you have never used a condom before you might like to practice putting one on by yourself before trying it with a partner.