"Withdrawl or pulling out the penis from the vagina before
ejaculation; is not effective against pregnancy. Sperm is in the fluid
before ejaculation, and any contact of male and female secretions may
result in pregnancy. Douching or rinsing the vagina out after
intercourse does not prevent pregnancy. A woman may still become
pregnant while breastfeeding, or immediately after her menstral
cycle."
http://www.crha-health.ab.ca/hlthconn/items/birth-c.htm
Sheesh,
Rohit