Jonathan Haidt brought this up in a podcast.

So, I'm never going to be able to unsee this.

When women talk to each other, they usually face each other at a 180° angle. When men talk to each other, we almost always do it at a 120° angle.

The way Haidt put it -- it's that, if men face each other straight on, it's either because we're gonna fight or we're gonna kiss -- there's basically nothing in the middle.

Surely enough, I was having a conversation with a couple of my guy friends at work. 120°. I wasn't even aware of it until I was.