Why are men become braver when they's drunk?

I think most men want and need to feel manly and drinking helps them lose their inhibitions. In high school I use to think, I can't wait to get into an adult environment where the males don't brag about going out and getting drunk, but when I did it was just the same - strut and brag. I don't understand why anyone would risk losing the ability to reason by going out and getting drunk. Can anyone explain that to me?

I don't think this behavior is braver.Because when they are drunk ,their brain is not manipulative ,so they could say anything and don't consider anything insult.So,I don't agrre of your consider.