Make eye contact.
Maybe that staring contest isn't such a bad idea. Back in 1970, Zick Rubin, a social psychologist, conducted a study on 158 college-age couples. He observed how much time the couples spent making eye contact, and then had them fill out a survey about their relationships. Rubin concluded that the more eye contact the couple made, the stronger their relationship.
Other studies have arrived at similar conclusions: Staring into each other's eyes appears to increase feelings of intimacy even among strangers.
A "thank you" can go a long way — not just for the recipient of the remark, but for the one making it as well. A 2010 study found that people who felt grateful for a kind act done by their partner also reported feeling closer to them. The feeling of gratefulness was more important than the act itself.
Based on a 2014 study on happiness and attractiveness, researchers found that the attractiveness of a person increased depending on how intense of a smile they had.
As mortifying as it might be to share some of your most personal details, it might actually help win over your date.
According to a four-part study conducted by Harvard Business School researchers, 79% of those surveyed preferred to date a "revealer," classified as a person willing to come clean (even about sketchy behavior), compared to "hiders," or people who chose not to share that information.
Create your own secret language.
That goofy inside joke or expression you and your significant other share could be one way to deepen your romantic bond, according to a University of Texas study. Plus, it builds a shared identity, which is important for creating a feeling of belonging in the relationship.
Beyond a made-up language, a portion of a 2010 study on language found that couples who are more likely to last tend to start speaking like one another.