My dog gender-profiles.
She has never, never ever bitten anyone in anger. It's all a bluff and show, and it works, so she's never needed to.
She knows it's her job to answer the door with me when there's any stranger there, especially a male larger than me, or as in the case of one guy once in Sioux City, a male smaller than me but obviously high on something and carrying a length of pipe in his hand... He suddenly didn't need to speak with me when he saw the dog.
She is extra-watchful of men, even men we love such as relatives and church members. Male or female doesn't matter, though, if they're drinking or drugging. She hates that even worse.
She was allowed out to "go pee-pee" once (sorry, that's the verbal command we use; real adult, I know...) about 2 a.m. on a frigid, deep-snow Iowa night, and, disobeying me, bounded down the hill to deliberately knock the beer out of the hand of an inebriated lady who was staggering to her home up the hill from a bar. She bounced triumphantly back through the drifts, trotted up the walk and came in, head high, ears up, tongue lolling... I hadn't the heart to cuff her. I'm ashamed now that I didn't leash her & follow the woman up the hill to make sure she got home... It turned out for the best, though, she made it. No corpse on the sidewalk in the morning.
Something about the "evil" yellow eyes in that red-nosed pit bulldog face really turns away potential evildoers. Probably turns away others, too, but I trust a dog's sense of smell to pick up drugs, alcohol and misdirected testosterone long before I can...