"Coitus Interruptus Erroneous: Would You Believe That Pulling Out Actually Works?"
Withdrawal Method Finds Ally
Critique by sexologist:
In the 2002 National Survey of Family Growth (NSFG), withdrawal appeared to be almost as effective as condoms during typical use. However, in the 1995 NSFG, withdrawal was considerably less effective than condom use.
One of the many scientific sticking points surrounding the effectiveness of withdrawal is whether male pre-cum contains sperm. To my knowledge, only one study has been done on this with an N of something like 10. But that one study found that pre-cum doesn't contain sperm. So if this is valid, the main danger--aside from not pulling out quickly enough before ejaculation--would be from sperm that still might be in the urethra from a prior ejaculation. (Best to pee between ejaculations if you are using withdrawal for birth control!)
Withdrawal was the only method during the fertility decline in Europe, and was probably the only effective method of birth control used in the 1800s, when the average size of the American family decreased from 7 children to 3.5. I think it makes sense to propose it as a back up method when a woman skips a pill or two or passion keeps the condom unused.
Also see this exchange on the forum:
And this excerpt:
The truth is that the chance of pregnancy by pre-cum is so remote that it is a statistical nonfactor. Two separate studies conducted by the National Institutes of Health found no sperm in pre-ejaculate fluid, as did a study conducted by Connecticut State University in conjunction with Princeton University . The Department of Obstetrics and Gynecology at Rabin Medical Center in Petah Tikva, Israel also failed to find any trace of sperm in pre-ejaculate fluid, and the Kinsey Institute at Indiana University maintains that "pre-ejaculate rarely contains sperm." Despite the overwhelming evidence -- some of which is readily available at sources like WebMD -- some continue to propagate the myth, maybe because they believe the end justifies the means. But a serious problem warrants an honest discussion, even if not all of the evidence helps make a case for condoms.