i told my husband my terms of contract soon after we started dating. 1) be on time, i don't wait.
2) hit me once. make it good. i won't be there for a second hit.
3) you may have 1 affair. you will not have the balls to have another.
4) what's mine is mine, and what's yours is mine.
35 yrs later i haven't had to enact any of them. guess it's working. i would no more hit my husband than i would let him hit me. we are adults, we don't ask permission, but we do communicate about things that are needed and have priority over what is merely wanted.