What does this mean for dudes trying to get their beaks wet? It depends on what you want. The study concluded that the act of "smiling detracts from a man’s appearance of masculinity and maturity, which...[while] smiling makes a man appear more trustworthy, which is an important quality in a long-term mating context." So, if you're interested in a hot night of gooey fun, consider your mate's subconscious and turn your frown, uh, not upside down.
However, if you're looking to get married... try smiling, bro.
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Jeremy Glass is a writer for Thrillist and only smiles when there's a pizza in front of him.