LMAO - broke my sensei's nose once myself! we tend to fight dirty and cheat when at all possible. I just always wondered if some forms of contact sports (football, rugby, etc) and such weren't some holdover from primitive man's need to bring home the wooly mammoth. And I'd imagine that competition was fairly fierce for 'best hunter' - I know some of that is a gross over-simplification but....you mentioned the instinct telling you that you are the Alpha and not to back down - and sizing up the other males/knowing what it would take to beat them...
yes I do believe its more of a competition with men and not with woman. and there is always competitions with men. I don't feel I need to compete with woman and more importantly I feel the need to please them. I took a test for BDSM and after thinking about it even though I am Bi I did not think about it with a guy it was always in the context of with a woman.