The more successful hunters were able to sit very still for very extended periods of time thereby passing on this ability to their progeny. The fidgety types were all gobbled up by saber toothed tigers etc. The end result is that almost all modern men are born with this innate ability. Men are taught from a tender young age to be self- sufficient. To say that we love you is equivalent to saying that we need you.
Most men consider that a character fault.
It's not easy to admit to one's own character faults. Well, some men think it's a sure fire way to get into your pants. Surprisingly, it actually still works quite well. Please sleep with me. I'm sorry for whatever it is that I did.