Is an intrinsic activity that is done for its own sake rather than as a means to achieving any specific end. It is spontaneous and voluntary undertaken by choice rather than by compulsion. It enjoys an element of enjoyment, something that is done for fun.

Unstructured sexual or SM/BD encounter, often spontaneous.

a listenable and often enjoyable effort

The natural activity of children, play is characterized by spontaneity and facilitates growth and development.

Spontaneous and/or voluntary interactions and activities that are pleasurable and enjoyable; hands-on experiences that lead to learning/development of knowledge; opportunities to master activities through repetition and experimentation.