I'm not disagreeing - and am speculating as well - but this lack of intimacy might not matter if we males were cooperating in groups a lot (other than by emessage), say on a hunt; but we just don't do that anymore. I think my grandfather's male friendships were shallow-but-substantive meaning not intimate and squishy, but based on hard cooperative tasks, often physical such as "branding parties" on farms. Even as a kid these seemed to me to be all-shop-talk relationships, often. But they did find them satisfying, they knew they could rely on these guys in a pinch. Whereas I'm not at all sure that the guys I share my squishy feelings with would be there for me in a pinch.