Withdrawal

One way of preventing the sperm from entering the woman, even without the use of a condom, is for the man to withdraw his penis just before he ejaculates. Withdrawal is Not an effective technique. One reason is that the slightest mistake in timing permits a certain amount of semen to be deposited in the woman before withdrawal. Even a drop is sufficient to cause pregnancy. Of every 100 couples who practise withdrawal for a full year, 18 are likely to become pregnant.