Men compete with each other for ranking. I’ve observed it at meetings, dinner parties and other events where alpha males attempt to dominate the others and brag of their various achievements: pure anthropology.
This is undoubtedly true for young men between 16 and 25, who are constantly vying for the attention of any women in the vicinity. Men between these ages are forever fighting, squaring up to one another, mocking each other, and engaging in all manner of silly games intended to demonstrate dominance over their peers and establish a pecking order.
What surprises me a little about Ljh’s comment is that he still sees it going on, whereas in my experience this all starts to fade away after age 25 or so, and past 30 is almost gone completely. There was a time when meeting a bunch of men for the first time would put me on edge a little, knowing I was in direct competition with them. Nowadays I’m happy just to make friends, relax, and talk bullshit (I’m especially good at that last one).
It could be that Ljh moves in different circles from me. Perhaps in banking, law, and other industries where a big ego and alpha-male characteristics are advantageous you encounter men who still feel the need to establish dominance over their peers, even in middle-age. In engineering, or at least that branch which deals with oil and gas, there isn’t so much of that. I’ve found most of my colleagues to be very easy going and cooperative, more interested in getting along with people than outranking them. I put this down to them mostly being settled with wives and children. Why would you continue fighting for female attention when you already have a mate? There are better, less painful things to do with your time.
Something else I noticed was how little trouble you tend to get into when you pass a certain age. When you’re between 16 and 25 it seems remarkably easy to get into fights in bars, or attract the wrong sort of attention on the street. As you get older that stops happening (unless you encounter proper criminals), and I reckon it’s because most of the aggravation is posturing and establishing street cred among peers. A lary teenager doesn’t see a bloke of 35 as his peer, so won’t start kicking off with him to impress his mates, but if another teenager walks by he will. (There’s also the issue which young men are subconsciously aware of that older men can be fucking dangerous, as likely to kill them as fight them.)
In summary, as men settle down and the testosterone reduces they mellow out and become less competitive, generally speaking. Women, on the other hand? That’s a rather different matter.