Not efffective. The withdrawl method is when the male pulls his penis out of the vagina before ejaculation occurs. This is a very poor method of birth control. Even prior to ejaculation, the penis releases small amounts of fluid that contain sperm.
Better than nothing. Withdrawal is a method of birth control in which the man "pulls out" his penis from the vagina before he comes or ejaculates. The failure rate of withdrawal for pregnancy prevention is 24% in the first year if use. If used perfectly, the failure rate is 4%.