A woman’s body does not ‘absorb’ it. Though some sperm do go up into the womb, they make up only a tiny proportion of the man’s ejaculate. So the great bulk of the fluid can’t do anything else but ‘run’ out.

Since the average man produces about 5ml of sex liquid, it follows that getting on for 5ml will come out again. Female secretions will add a little to this volume.

I’m sorry you find the post-coital liquid a problem. However, couples who feel like you generally opt for using a condom – since this collects the whole of the man’s output.