What were the circumstances of her kicking and beating you in the bed? Did it seem to be a reflex on her part-- like when you tap someone on the shoulder from behind and they turn suddenly? Did it happen if you made a sexual move, or just accidentally brushed against her? Did she seem to be angry at you for taking liberties, or seem to be really defending herself? Did she seem afraid you would want more? Did you catch her by surprise? How did you negotiate the production of M and K? Don't mean to sound like the third degree, but this could be a clue to the root of this thing... If she was routinely expected to go along with incestuous contact when she was a girl, then she may indeed be deeply wounded and have no psychological choice but to defend herself. And the Japanese taboo on discussing sexual things outside the family may very well apply to her discussing with you anything that went on in her family of origin.
