Well, most women I know wouldn't hesitate to go back-to-back with me in a brawl. Probably most of the women in your life would too. Do you think for a minute your mom or your elderly grandma wouldn't have your back in a tight spot? Even if they knew they'd go down fast, they'd go down swinging and kicking. If you *started* the brawl, your mom would then kick your butt for being stupid enough to start a bar fight.
But why is it that when we talk about equality, we always use examples like brawls that highlight males' physical strengths? Why not "if you can tread water for 24 hours" or "if you can run 40 miles to go for help", not to mention "if you can go through ten hours of labor"? There plenty of physical tasks at which women outperform men. I can outrun my wife easily for short distances and lift much more weight than she can, but she can run or swim distances that would send a typical guy to the emergency room.
Both quick bursts of strength and long-term endurance are mighty useful in real life (and in bar fights), especially when combined with determination and a protective instinct.