Sometimes, all it takes is a look.

For some single people, it can be hard to tell when someone is actually flirting with you. Fortunately for them, new research suggests that there may be a specific facial expression that women use when they’re flirting.

A study published in the Journal of Sex Research says that there are certain facial expressions that signify interest in a potential partner, Southwest News Service (SWNS) reports. According to the study, men can recognize this expression as showing attraction.

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The flirty facial expression that seems to work best for women is to turn the head to one side, tilt it down slightly with a slight smile and have the eyes turned toward the target.

“Across our six studies, we found most men were able to recognize a certain female facial expression as representing flirting,” Omri Gillath, professor of psychology at the University of Kansas, told SWNS. “It has a unique morphology, and it's different from expressions that have similar features -- for example, smiling -- but aren't identified by men as flirting expression. Our findings support the role of flirtatious expression in communication and mating initiation.”

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Researchers say that their work revealed exactly how men’s brains react to certain expressions. Certain looks can reportedly activate associations with relationships for men.

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Gillath continued, “For the first time, not only were we able to isolate and identify the expressions that represent flirting, but we were also able to reveal their function -- to activate associations related with relationships and sex.”