Here are few rules every gentlemen drinker should adhere to as a matter of decorum :

• Don’t drink from a straw
• Learn to make at least one exotic foreign drink
• Always drink less than your boss
• Buy a round for the bar at least once in your life
• Dont say I love you after too many drinks
• Don’t fall asleep on the bar (I added this one myself but thought it should be part of the list)

For all the rules go to http://www.esquire.com/food-drink/drinks/g2383/the-rules-of-drinking/