Participants in an open marriage

- encourage each other to have close, meaningful relationships with others.

- discourage each other from having emotional relationships outside the marriage but encourage sexual encounters.

- often evolve into "swingers."

- are committing a felony in most states.

Answer: Encourage each other to have close, meaningful relationships with others.

Explanation:

Open marriage is known as or referred to as a form or kind of non-monogamy under which partners of well formulated dyadic marriage tend to agree that they may engage or indulge in an extramarital sexual relationship, that might not be regarded as infidelity by them, and thus is consider or known to establish an open marriage or relationship despite the fact being that marriage is monogamous.