There are a few ways to help ensure that your sperm stays inside during sexual activity:
1. Use a condom: Condoms are a highly effective method of preventing sperm from escaping during ejaculation. Make sure to use a properly fitting condom and use it correctly every time you have sex.
2. Practice withdrawal method: If you are not using any other form of contraception, withdrawing before ejaculation can help prevent sperm from entering the vagina.
3. Communicate with your partner: Make sure to communicate with your partner about your desire to prevent pregnancy and discuss the best methods for doing so.
4. Consider other forms of contraception: If you are looking for a more reliable method of preventing pregnancy, consider using other forms of contraception such as birth control pills, intrauterine devices (IUDs), or contraceptive implants.
5. Seek medical advice: If you are concerned about your ability to prevent pregnancy, consider speaking with a healthcare provider for personalized advice and recommendations.