The sperm is alive in a adult woman's body for no longer than 3 - 5 days maximum, if all conditions inside the uterus are conducive. This may not be applicable for a 10 year child, again depending on how he body is developing. Thinking about sex with a 10 year old is just reprehensible, not to mention unlawful. If you would like to join in on a further discussion on this topic, join our discussion board, "Just Ask” https://lovematters.in/en/forum