Is there a line that can be crossed and, if so, where do you draw that line?

Bondage, discipline, dominance and submission, sadomasochism (BDSM) practices range from mild to wild. Although most people engage in relatively mild activities, should people be permitted to carry out their desires no matter what? Is there a line that can be crossed and, if so, where do you draw that line? (Lehmiller, Justin J.. The Psychology of Human Sexuality, John Wiley & Sons, Incorporated, 2017. ProQuest Ebook Central,

Write an essay addressing these questions.
Give at least two examples to support your conclusion.