Romantic attraction is a complicated thing that scientists still don't completely understand.
But, through research and experimentation, they've come up with many ideas about what draws one person to another.
Below, Business Insider has rounded up some of the most compelling scientific insights about the traits and behaviors that make men more appealing to women.
The best part? None of the items on this list require you to get cosmetic surgery or do a major personality overhaul. We're talking small tweaks, like acting nicer and swapping your deodorant.
Read on for simple ways to step up your dating game.
This is an update of an article originally posted by Drake Baer.
Look for the universal signals of flirtation
Rutgers University anthropologist and best-selling author Helen E. Fisher says that women around the world signal interest with a remarkably similar sequence of expressions.
As she shared at Psychology Today, it goes like this:
"First the woman smiles at her admirer and lifts her eyebrows in a swift, jerky motion as she opens her eyes wide to gaze at him. Then she drops her eyelids, tilts her head down and to the side, and looks away. Frequently she also covers her face with her hands, giggling nervously as she retreats behind her palms.
"This sequential flirting gesture is so distinctive that [German ethologist Irenaus] Eibl-Eibesfeldt was convinced it is innate, a human female courtship ploy that evolved eons ago to signal sexual interest."
Look for someone 'in your league'
Men - and women - are attracted to people who are as attractive as they are.
In one study, researchers at the University of California at Berkeley looked at the behavior of 60 heterosexual male and 60 heterosexual female users on an online dating site. While the majority of users were inclined to reach out to highly attractive people, they were most likely to get a response if that person was about as attractive as they were (as judged by independent raters).
"If you go for someone roughly [equal] to you in attractiveness, it avoids two things," Nottingham Trent University psychologist Mark Sergeant, who was not involved with the study, told The Independent. "If they are much better-looking than you, you are worried about them going off and having affairs. If they are much less attractive, you are worried that you could do better."
Present yourself as high status
A 2010 study from the University of Wales Institute found that men pictured with a Silver Bentley Continental GT were perceived as way more attractive than those pictures with a Red Ford Fiesta ST.
And a 2014 study from Cardiff Metropolitan University found that men pictured in a luxury apartment were rated more attractive than those in a control group.
Interestingly, men don't seem to be more attracted to women when they're pictured in a high-status context.
Psychologists call it the "George Clooney Effect."
"We think this suggests greater financial independence gives women more confidence in partner choices, and attracts them to powerful, attractive older men," lead author and University of Dundee psychologist Fhionna Moore said in a statement.
Evolutionary psychologists say that younger women and older men often pair up because while fertility only lasts from puberty to menopause in women, it can extend long into midlife for many men. Society also gives men greater opportunity to accumulate status and resources as they age.