Have you sat down with your W and had a discussion about the values you want your girls to live by? If you set up a code that you both agree on then you can hold each other accountable to ensure that your actions are demonstrative of this code. This way it's not just a matter of personal opinion ("I don't really agree with telling them not to tell") but it's a matter of doing your best to uphold the values ("telling the girls not to tell would go against the value of honesty that we are trying to instill in them").
Furthermore, coming to agreement on values will allow both of you to grow in the same direction as people because you are agreeing to share the same values. The best way to teach children is to model behavior.
“No problem can be solved from the same level of consciousness that created it. ” – Albert Einstein