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Sexual intercourse between a married couple and male stranger. Typically involves the married couple propositioning the male stranger to do The Double M. Motivations for propositioning the stranger vary from sexual dissatisfaction to mere curiosity. Some married couples habitually engage in The Double M and are considered a sub-category of swingers. For the sexual intercourse to be classified as The Double M there must be full penetration. If the three participants are fondling each other without penetration it is not considered The Double M. The purist's definition of The Double M stipulates that the male stranger must be a first-timer (i.e. it must be his first time having intercourse with a married couple). Purists also insist that The Double M only involves heterosexual positions (i.e. the two men do not fondle or penetrate each other in The Double M).
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