Can Sperm Survive in Laundry? Concerns About Pregnancy Risks Explained - Obstetrics and Gynecology

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Can I get pregnant?


I accidentally ejaculated in my underwear and, without handling it, threw it into the washing machine, which washes with everyone else's clothes, including my sister's.
Is it possible for sperm to remain on her underwear and cause pregnancy? Additionally, if my hands come into contact with semen, can rinsing them with just water effectively remove the sperm? I'm really worried about sperm residue.

Yizhe, 10~19 year old female. Ask Date: 2017/12/21

Dr. Huang Jianzhong reply Obstetrics and Gynecology


Accidentally ejaculating onto underwear and then washing it in a washing machine with other clothes, including a sister's, does not pose a risk of sperm remaining on her underwear and causing pregnancy.
If hands come into contact with semen, rinsing them with plain water can effectively remove the sperm.

Reply Date: 2017/12/21

More Info


When it comes to concerns about sperm survival and the potential for pregnancy, it's important to understand the biology of sperm and the conditions that affect its viability. Sperm can only survive for a limited time outside the human body, and various environmental factors can significantly reduce their lifespan.

1. Sperm Survival on Fabrics: Sperm that is exposed to air and dries out quickly loses its viability. Once sperm dries, it is no longer capable of fertilizing an egg. In the case of sperm that has been deposited on clothing, such as underwear, it is highly unlikely that any viable sperm would remain after the fabric has been washed in a washing machine. The combination of water, detergent, and the mechanical action of the washing machine would effectively eliminate any remaining sperm. Therefore, the risk of pregnancy from sperm that has been washed out of clothing is virtually nonexistent.

2. Sperm and Water: If sperm comes into contact with water, especially in a washing machine, the sperm cells are likely to be damaged and die quickly. Sperm are sensitive to changes in their environment, including temperature and pH levels. When exposed to water, especially in a non-physiological environment like laundry, they cannot survive for long. Even if some sperm were to remain on a surface after washing, the likelihood of them being viable is extremely low.

3. Concerns About Touching Semen: If you touch semen and then wash your hands with just water, it is generally advisable to use soap to ensure that any potential sperm are completely removed. Water alone may not be sufficient to eliminate all traces of semen, especially if it is thick or has dried. Using soap and water is the best practice to ensure cleanliness and reduce any risk of transferring sperm to another surface.

4. Pregnancy Risks from Indirect Contact: The concern about sperm being transferred from clothing or hands to a partner's genital area is understandable, but the likelihood of this resulting in pregnancy is very low. For pregnancy to occur, sperm must be deposited directly into the vagina in a viable state. The conditions outside the body, such as drying and exposure to water or detergents, significantly diminish the chances of sperm remaining viable.

5. Understanding Fertility: For pregnancy to occur, a sufficient number of healthy sperm must be present to penetrate the egg. This typically requires a significant quantity of sperm, as only one sperm can fertilize an egg, but many must reach the egg to ensure successful fertilization. The presence of viable sperm in a non-ideal environment (like dried semen on clothing) does not provide the necessary conditions for conception.

In summary, the risk of pregnancy from sperm that has been washed out of clothing or from touching dried semen is extremely low. Sperm do not survive well outside the body, especially when exposed to air, water, and detergents. If you have concerns about cleanliness after handling semen, using soap and water is the best approach. If you are still worried about potential pregnancy risks, consider consulting a healthcare professional for personalized advice and reassurance.

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