I think the reason why males return quicker than females is because usually a male will make a knee jerk decision and break up or leave the situation thinking the grass is greener on the other side because his current girl had some mood swings or something. They are way too quick to make those decisions. Then they go find out that the grass on the other side isn't really greener, it's just green where you actually water it.
Females typically think things through and have more staying power to deal with stuff and so when we actually make the decision to leave a relationship, more often than not, we have thought things through for a very long time and most likely haven't been happy for a very long time so then we make that choice and typically, once a female leaves, she isn't leaving for a "break" but rather to find a completely new permanent mate.
Now that isn't ALWAYS the case. But that's statistically speaking and is the case most of the time.
Just like usually when a man cheats, it's just for either emotional or physical gratification but they have no intentions of leaving the relationship permanently. It's more for selfish purposes. However, most of the time when a female cheats, she's actually looking to move on and looking for a new partner rather than just temporary thrills, but she isn't able to be alone so she has to cheat to find someone else before ending what she is currently in.
Just my observations.