I thought of that, but once the person has spent a lot of time with another person they are more likely to continue to mating (as you call it) with that person, rather than find someone else.
Even if they would have never chosen that person in the first place (for mating) if they were more selective at the outset.
Either way, I think that you can just as easily say that a woman is more likely to leave a "bad" candidate for mating, since she is not tied down by the presence of offspring.
Even if they would have never chosen that person in the first place (for mating) if they were more selective at the outset.