yeah, i don't know why people keep on bagging on posters about using protection when it's obvious they are aware of their folly and have taken steps to improve their situation. it just seems like people sometimes go out of there way to drive it into the ground.
you're talking about the withdrawal method as described at:
http://www.plannedparenthood.org/bc/bcfacts3.html
apparently 27% of couples who use this method over a year's time will have a pregnancy. among couples who implement this perfectly (no mistakes or lack of judgement) the number drops to 4%.
incidentally, those numbers drop to 15% and 2% respectively for using a condom as the primary means of birth control.
http://www.plannedparenthood.org/bc/condom.htm
so... it appears that using the withdrawal method is a legitimate method of birth control, but far from perfect. a condom will reduce your odds, but it won't eliminate them. i highly reccomend not have vaginal sex at all until you're married and want to have kids. the possibility of a pregnancy is unavoidable... be sure you are willing to accept the consequences of what you do. there is plenty of other stuff that can keep you occupied until then.
