Concerns Pregnancy and passage of STDs still may occur if couple's genitals touch. There are no practical benefits to this method. See Concerns Concerns Not effective against sexually transmitted infections Some men lack the experience and self-control to pull out in time. Some men have been known to say they will pull out, and then they get so excited and carried away that they don't. Some men cannot tell when they are going to ejaculate.
Some men ejaculate very quickly, before they realize it.