Cultural institutions which serve alcohol, such as bars and pubs, often attract more violence than other cultural institutions. This may be related to the inhibition-reducing effects of drunkenness. Bouncers are employed to keep order. A bouncer (also known as a doorman or cooler) is an informal term for a security guard employed at venues such as bars, nightclubs or concerts to provide security, check legal age, and refuse entry to a venue based on criteria such as intoxication, aggressive behavior, or attractiveness. Bouncers are often required where crowd size, clientele or alcohol consumption may make arguments or fights commonplace.