“When it comes to BDSM kinks, some people, like my former partner, fit snuggly into a specific role: a dominant (one who takes a controlling role) or a submissive (one who submits to the dominant partner). However, while I’m primarily submissive, I realized that I am what’s known in BDSM as a “switch.” …”

link: http://www.refinery29.com/what-is-a-switch-sexually