She swivels her hips to the left and stretches her right leg forward to the right side of the man.
She swivels her hips to the right and stretches her left leg forward to the left side of the man.
She swivels her hips to the right and stretches her right leg backward to the right side of the man.
She swivels her hips to the left and stretches her left leg backward to the left side of the man.
These scenarios occur in many tango steps such as front ocho, back ocho, walking on the side of the partner, walking in diagonal steps, dancing around the man in molinete, zigzagging in molinete, turning a half circle around the man in media luna, etc. TBP is the reason why women's beauty can be fully displayed in tango.
This gives us a clue on how to make her look more beautiful in the dance. For example, we can display the suppleness, pliancy and grace of her body by using steps that involve TBP and hip rotation. We can make her step diagonally to our right and left. We can alternate her ochos to make her rotate her hips continuously. We can increase her TBP in back ocho by stepping diagonally to her side to make her twist her body more than if we walk straight in line with her. We can combine different steps to increase the variations of her posturing. We can suspend her TBP with slow motion, or pause when she is in a twisted body position to highlight her flexibility, etc.
Therefore, dancing tango is not doing big ochos and big turns endlessly, which is a common delusion in our tango. (See Floorcraft, Choreography and Hastiness.) Rather, it is using a combination of conspicuous and especially inconspicuous movements, big and especially small steps, normal and especially slow motions, fluxions and especially suspensions, pauses and poses, etc., to express the feelings stirred by the music. The number one reason why women love tango, I believe, is their sentimentalism. Tango is an intimate and sentimental dance, and women are particularly emotional and good at expressing feelings. Feminine beauty thus lies more in a woman's psyche than in her appearance. Revealing her inner beauty is a leader's most challenging and rewarding test. (See The Conceptional Beauty of Tango.)