(Our happy hour fact to amaze your drinking buddies with.)

When puppies play fight, the males will often let the females win, even when they have a physical advantage.

A recent study found that boy puppies "self-handicap" in intra-sex grappling by giving their counterpart the chance to bite them in vulnerable positions, and by sometimes collapsing to the ground like they have been knocked out even though there was no contact.

"We know that in feral dog populations, female mate choice plays a role in male mating success," said the study's author. "Perhaps males use self-handicapping with females in order to learn more about them and to form close relationships with them."

If you decide to give self-handicapping a try with your lady friend, we highly recommend not including the part about giving her a chance to bite you in vulnerable positions ... unless you're into that sort of thing.

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