It's up to the couple.

A marriage in which the emphasis is on self development, flexible roles, and open communication.

• An open marriage means you can have more than one sexual partner or, both of you can have several sexual partners. When taking marriage vows you should have taken them more seriously and just lived together. It is wrong to have an open marriage, but as they say, 'each to their own.' If you have to ask this question then you are not all that interested or in agreement with an open marriage so stand your ground and don't do it.

Honesty. Open communication. Faithfulness.

All these things are covered in the marriage vows.

Yes