BDSM practitioners sometimes regard the practice of BDSM in their sex life as roleplaying and so often use the terms "play" and "playing" to describe activities where in their roles. Play of this sort for a specified period of time is often called a "session", and the contents and the circumstances of play are often referred to as the "scene". It is also common in personal relationships to use the term "kink play" for BDSM activities, or more specific terms for the type of activity. The relationships can be of varied types.