Women know this, because when a woman isn't smiling, people notice. Some female celebrities who don't smile often, like Kim Kardashian, have publicly commented on their choice not to smile.

A woman who is unable to smile due to a rare neurological disorder has defied her bullies by embarking on a "self-discovery and healing journey" that has led her to find self-confidence - as well ...

Or: “Why you so mad? Smile!” Or: “You’re pretty. You would be prettier if you smiled.” In this moment, Rosie Meegan is faced with a choice that nearly all women recognize, and a choice ...

Women do smile more than men, but when occupying similar work and social roles, the gender differences in the rate of smiling disappear, a Yale researcher has found. Also, there are large differences ...