The practice of having multiple sexual partners outside of an existing romantic relationship, most often with the understanding that the focus of those relationships is primarily sexual rather than romantic or emotionally intimate.
See also friends-first swinging, closed swinging, closed-group swinging, swing club.
Commentary: The common perception of swinging is that those who engage in this behaviour have sex outside of their existing relationship purely for recreation and that emotional bonds or emotional intimacy are specifically excluded. This is true in some cases, and in fact, some swing clubs specifically prohibit people from carrying on friendships or relationships outside the club. However, in practice swinging is much more nuanced, and people who self-identify as swingers can and sometimes do form close emotional relationships with their partners. Many people in both the swinging and polyamorous communities, though not all, see swinging and polyamory as two ends of a continuum, different in degree of intent, focus, and emphasis on romantic and emotional relationships rather than differences in kind.