How long does sperm last in a woman? and is it possible for a woman to reject all of the sperm? thank you all.

Survive about 5 days: If sperm reach the fallopian tubes. They can't go that far if ur menstruating, at which time one could say a woman does reject sperm. It is possible for all of a man's semen to leak out of vagina after sex without any reaching the uterus. Vaginal secretions, in some woman, can be lethal to sperm causing infertility problems. But condoms + birth control medication are advised to avoid pregnancy.