Both partners may find it helpful to make a list of non-negotiable or “deal-breaker” guidelines for behavior. Is there an expectation of fidelity, or will the marriage be open? If the marriage is open, what are the rules for engagement with sexual partners outside the relationship (e.g., “no sexual activity in the family home,” “both parents must be home for holidays and birthdays,” etc.). Issues that are important to you now may change over time, so keep the dialogue open and transparent. What one partner finds unacceptable in the beginning, may relax over time. Conversely, a behavior you thought you could live with may wind up being not so tolerable in reality. Revisit the rules as needed.