<unk> s, also known as<unk>  birth control, are methods of preventing pregnancy that solely involve the<unk>  physiology. The most common kinds of<unk>  contraception include condoms, outercourse, and vasectomy. In domestic animals, castration is commonly used for contraception. Other forms of<unk>  contraception are in various stages of research and development. These include methods like RISUG/VasalGel (which has completed a small phase II clinical trial in humans in India) and ultrasound (with results so far obtained in experimental animals).
Male contraceptive
Antiprogestogen
Phytoprogestogen
Extended cycle combined hormonal contraceptive
Spermicide
Nonsteroidal estrogen
High-dose estrogen
Pessary