Quote Originally Posted by a98tegLS
Seriously, why has nobody mentioned the rythm method?
People have a hard enough time with a strict schedule of birth control...and each person has to know their own cycle, there is no standard...can't say 12 days fertile & 14 days infertile is correct for everyone.

PLUS sperm live for 72 hours inside, you have to factor that in the last 3 days of being "infertile"