What is coming out of her body is mostly semen. Think of semen as the large bus, and sperm as the tiny passengers it carries. The bus shoots at top speed to the dead-end cul-de-sac where there is a tiny opening for pedestrians only. It screeches to a halt and the pedestrians swim out and frantically rush through the tiny opening and up, up up the footpath (Fallopian tubes) looking for the lovely egg. Nothing, frankly, can stop sperm in its uphill swim, even if she were to stand up and jump around and squat over the toilet, the sperm is swimming up the tubes at that point and could not care less. It is true that women have been known to elevate their hips and even stand on their heads, but a lot of that might just make them feel better, science has never been able to prove definitively that it helps. Anyway, the end of the vagina is not absorbent to the extent that you imagine. It is designed deliberately to strip away all the semen and to only admit the sperm. So of course a lot of semen does come dripping out after sexual relations, or the next day. Don't worry.
Good Simile and proper explanation.
Hoped this helps you , take care ,