Why do some guys need liquid courage?

I've known this guy for awhile. When I see him, he's pretty happy to see me, all smiles, goofy, loves to tease me...yet he can't look at me. He's pretty content to talk to me but just stares ahead, not looking at me only occasionally glancing at me. It isn't until he has had a few beers when he finally turns to me, looks me in the eye and even taps my on my hand or arm or nudges me playfully. Why the liquid courage? We have known each other for awhile. What does this mean?
Why do some guys need liquid courage?
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