According to a recent paper by Guttmacher, perhaps…
A new commentary, “Better Than Nothing or Savvy Risk-Reduction Practice? The Importance of Withdrawal,” by Rachel K. Jones et al., published in the June 2009 issue of Contraception, highlights that withdrawal is only slightly less effective than the male condom at preventing pregnancy. Yet there is a general reluctance among health care providers and individuals alike to consider withdrawal as a viable method of contraception—even as a backup to more effective methods or as an alternative to not using contraceptives at all—which likely stems from misconceptions about its effectiveness at preventing unintended pregnancy. The article examines why this lack of enthusiasm persists despite the method’s relative effectiveness, as well as the consequences of the method’s lack of popularity.
The best available estimates indicate that with “perfect use,” 4% of couples relying on withdrawal will become pregnant within a year, compared with 2% of couples relying on the male condom. More realistic estimates suggest that with “typical use,” 18% of couples relying on withdrawal will become pregnant within a year, compared with 17% of those using the male condom. In other words, with either method, more than eight in 10 avoid pregnancy.
I don’t know. Still sounds awfully shady to me. There’s way too little margin for error. And maybe I’m just having high school backseat flashbacks, but you’d really have to trust your partner to have the self-awareness and self-control enough to pull out in time. Mm. Nah. Even the best-intentioned person can lose their head (yeah yeah yeah) in the heat of the moment.