How long do sperm live inside the womens body? some ppl say 3-5 others up to 7 am confused!!!

Maybe all are right: Nobody knows how long a specific person's sperm will survive in a specific person's body, on a particular day, after certain activities, and before other activities... which means it's all an unknown (so, 3~5~7). That means one should avoid that question, by either using contraception properly if not wanting a baby, or having sex daily for several days around ovulation time if wanting a baby.