Imagine, if you will, that a committed, loving, Taken-In-Hand couple decides that they want just that: a little competition of the wills, so to speak—a friendly contest—exhibition—of physical power—one where the winner 'takes all,' if you dig. ;-D
In this excursion, he agrees to, with a safely limited goal and her continued safety in mind, 'unchain,' if you will, more of his physical capacity than she has previously been privileged to experience, in order to safely, and yet still wholly physically, constrain her, and overcome her, his wife, whom he loves, in order to inexorably prevail in entering into her in love.
And in this excursion, because of her desire to more fully know his physical power, she resists strongly, to be challenging and worthy of conquest, simply to require his better efforts, in order to experience the strivings required for him to overcome her; to discover his superior strength and the surpassing passion which can spring out as he desires to know her and to take her, even as she is losing at their match.
It is a great and deep privilege for those women who desire it to experience at first hand more of the strength of the man to whom she has entrusted her safe-keeping.