DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Vasectomy surgery. Patient's vas deferens being clamped during vasectomy, or male sterilisation surgery. The two vas deferentia that carry sperm from the testes to the penis are cut and tied, or sealed. This stops sperm from being ejected at ejaculation, providing a method of contraception that is nearly 100% efficient.
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