9.1 Mechanism of action
Voluntary surgical contraception (VSC) is a permanent family planning method, which involves female sterilisation or male sterilisation. In women, the process is called fallopian tube ligation or tubal ligation, and involves mechanically blocking the fallopian tubes by cutting them to prevent the sperm from reaching the egg. In men, vasectomy involves blocking the vasa deferentia, or sperm ducts, to prevent the passage of sperm into the semen, so that fertilisation and pregnancy during sexual intercourse cannot occur. You will see diagrams illustrating these procedures later in this study session.