Who would win in a mortal fight between a guy and a girl?

Suppose that an average guy and an average girl in their 20s fight each other with no tools, no weapons, and even no clothes. Also, no rules (for example ball or eye attacks are allowed), and each side tries one's best to kill the other. Then who would win? I think there is a high chance that girl would win because if guy gets kicked or grabbed in the balls, he can't do anything. Also I've seen several news articles saying that woman killed man by grabbing balls, in China and America, etc. What is your opinion?
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Who would win in a mortal fight between a guy and a girl?
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