Why do girls become really touchy and flirty while drunk?

I'm laid back while drunk but girls take it to a new level. Their are girls who I'm friendly with and say hi to when we cross paths that can't keep their hands off me me while drunk. Some have BF's and don't like me like that. The other girls are so touchy and I don't understand how alcohol does that to people. Guy generally lose sex drive or become more laid back while drunk but girls get crazy. These girls don't like me as far as I know.
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Why do girls become really touchy and flirty while drunk?
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