Most religions disapprove of sex outside marriage (see religion and sexuality), and the consequences range from very serious to none.
Also, marriage is defined in quite different ways in different cultures, for example, with "short-term marriage" (see Nikah mut'ah) a cover for prostitution, or polygamy.
Some couples see swinging as a healthy outlet and a means to strengthen their relationship.
Others regard such activities as merely social and recreational interaction with others.
During the sexual revolution in the United States and Europe in the 1960s and 1970s, social attitudes to sexual issues underwent considerable changes.
Swingers who engage in casual sex maintain that sex among swingers is often more frank and deliberative and therefore more honest than infidelity.
This allowed for casual hookups to become a more common occurrence in the teen and young adult dating experience.