The man withdraws his penis from the vagina before ejaculation.
With typical use, 27 women in 100 (27%) become pregnant in one year. With perfect use 4 women in 100 (4%) will become pregnant in one year.
It’s better than not using any protection, but still isn’t a very effective method of birth control.
Doesn’t protect against STDs including HIV. Because sperm can live in pre-ejaculate (pre-cum), even if a man withdraws early, there is a chance of getting pregnant. Also, it may be a stressful method to rely on–women have to rely on men to get it right; and men have to remember to withdraw prior to ejaculation.
How To Get It
You just do it.