Party Boy/Broken Steel

Party Boy or Party Girl (depending on the player character's sex) is a perk in the Fallout 3 add-on Broken Steel, Fallout 4, and Fallout 76.

Fallout 3
With this perk, the Lone Wanderer does not suffer any withdrawal effects from alcohol addiction.

Fallout 4
This perk focuses around making alcoholic beverages more effective. The first rank removes the risk of alcohol addiction, the second rank doubles the positive effects of alcohol and the third rank increases one's Luck by 3 whenever under the influence of alcohol.