Why is Joanna sometimes seen in bondage in "Mr. Robot"?

One of the main themes of the season 2 premier was that "control is an illusion." We think of people in bondage as being the submissive ones, but it is later revealed that it's actually Joanna who has control over the guy she is having sex with. I think this scene adds on to the theme of control.

She has a high tolerance for pain, likes being submissive and not in control. I think where her bondage comes into play in terms of character development is when she provoked Scott to the point of beating her. The point was to get him to beat her and commit a crime so she can either have him arrested or have leverage on him. Most people wouldn't put themselves in such a situation, but she has a higher tolerance for pain and less fear of it. She frequently puts herself in situations where she seemingly has no control, but she knows she has, or will, regain it. So she is at ease here too.