Swinging, sometimes called wife swapping, husband swapping or partner swapping, is a sexual activity in which both singles and partners in a committed relationship sexually engage with others for recreational purposes. Swinging is a form of non-monogamy and is an open relationship. People may choose a swinging lifestyle for a variety of reasons. Many cite an increased quality and quantity of sex. Some people may engage in swinging to add variety into their otherwise conventional sex lives or due to their curiosity. Some couples see swinging as a healthy outlet and means to strengthen their relationship.