Is it considered backbiting to talk with one's sister about her husband's behavior, or for women to talk about their husbands regarding actions they dislike?

If two sisters discuss the husband's private matters, such as intimacy, this is not permissible because it involves disclosing a forbidden secret. However, if the discussion is about the husband's work affairs, for the purpose of fostering compatibility between the spouses and studying appropriate behaviors, without inciting disobedience or disparaging the husband, then outwardly there is no harm in it. Nevertheless, women recounting their husbands' situations may carry caveats, such as belittling their husbands or reporting things they dislike.