Why do people tell boys/men to smile in pictures when smiling men look unattractive?

Tonytoutouni123
Usually people try to look extra handsome in pictures. There are studies like this (https://news.ubc.ca/2011/05/24/happy-guys-finish-last-says-new-study-on-sexual-attractiveness/) that clearly show that men look very unattractive when they smile.

If you think about male models, for example, most of them don't smile in pictures either. But why then are we taught since childhood with phrases like "say cheese" to smile in pictures?
Why do people tell boys/men to smile in pictures when smiling men look unattractive?
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