Male contraceptives are methods of preventing pregnancy that primarily involve the male physiology. The most common kinds of male contraception include condoms, withdrawal / pulling out, outercourse,[1] and vasectomy.[2] In domestic animals, castration is commonly used for contraception. Other forms of male contraception are in various stages of research and development.[3] These include methods like RISUG/VasalGel (which has completed a small phase II clinical trial in humans in India)[4] and ultrasound (with results so far obtained in experimental animals[5][6]).