Withdrawal :

The withdrawal method (also known as coitus interruptus ) is the practice of ending intercourse ("pulling out") before ejaculation. The main risk of the withdrawal method is that the man may not perform the maneuver correctly or in a timely manner . First-year failure rates vary from 4% with perfect usage to 22% with typical usage. It is not considered birth control by some medical professionals.  There is little evidence regarding the sperm content of pre-ejaculatory fluid. While some tentative research did not find sperm, one trial found sperm present in 10 out of 27 volunteers. The withdrawal method is used as birth control by about 3% of couples.

This method is also has some drawbacks . male produces some lubricating fluid from his cowper glands before ejaculation. This fluid contains many sperms. A lapse in timing or willpower may result in late withdrawal and hence pregnancy .