As a dancer in my youth, it's a bit funny reading someone writing this as research. Dancing is physically close, intimate, other-person-way-closer-than-your-regular-comfort-zone by nature. Add to that that eye contact, again inherently intimate, is crucial for coordinating any nuanced moves and you'd be hard pressed to find anything other than the above result. There is no way to put in the hours of rote practice, sweat, awkward mishaps and more without becoming intimate with your dance partner. I'm not saying it's bad there's research into this, I'm more so surprised this is something that was only strictly established by research in 2015.