Sex face — it's the face we make when we're having sex.
Also known as the O face — you can guess what that stands for — it is a primal and universally appreciated erotic expression.
"It's good to be the king," Sexpert Chantelle Austin told Cosmopolitan, when explaining why it was such a turn on. "Everybody wants to know they are doing it right. It's part of our nature to want to be the best."
Sometimes the O face is a genuine expression of pleasure. Other times it is a put-on for a partner who just isn't working.
In any case, below are nine O Face GIFs for almost every situation.