When a man withdraws his penis out of a woman's vagina during intercourse as a form of birth control. It is not a very effective method of birth control since the man might not pull out in time. Semen can also be present in the precum if the man did not urinate several times since his last ejaculation.
Using the pulling out method correctly along with the correct use of a condom is pretty much a no-pregnancy guarantee.
If you don't want me to ejaculate inside, I can pull out.