Having multiple non-marital partners, even if married to one, is legal in most U.S. jurisdictions; at most it constitutes grounds for divorce if the spouse is non-consenting, or feels that the interest in a further partner has destabilized the marriage.

Is dating two people at once illegal?

While the boundaries in polygamous relationships are quite different from those for monogamous relationships, they still exist. Polyamory should not be confused with bigamy or polygamy, which involves marriage to more than one person and is illegal in the United States.