Stupid question.. halp

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Girls, what is the LEAST amount of time sperm live in you? I always hear the 3-5 days is how long they can live, but do they stay there for at least 24 hrs? Is that why they say to do it every other day? Also what happens to the old ones when the new ones come in? Do they high 5 like a relay marathon situation or whats the deal? Its amazing how much I dont know LOL I find the longer its taking ttc the more questions I have