OP, that is probably the most profoundly existentialist post ever, in the worldwide history of forums. m indeed! m? Or, looking at it a different way, m! Added to its fellow ms, m becomes an expression of delight, even of joy: mmmmm! for pleasure. With fewer fellows, mmm? denotes indecision and, perhaps, doubt. What woman has not hummed "mmm?" at a talkative child or asked, of a weakly self-excusing husband, "mmm?"?
There we have the crux, the very essence, of m: Rounded, replete with significance, manifold of meaning and perfectly adapted to multitasking, m is the feminine. Feminine, womanly, mysterious yet expressive - m is woman.