Back to School: First to get pregnant a sperm must be fresh and left inside of the vagina and second there must be an egg readied for impregnation (this is known as ovulation). About 30% of couples who use the 'withdrawal' method of birth control get pregnant. An erect penis is leaking semen before ejaculation. This is known as pre-cum. Pre-cum has the same concentration of sperm in it as does ejaculation.
Answered 2/11/2014
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