Question re/ friends of the opposite sex:

I use the word "friend" sparingly. I do have acquaintances...none of whom I speak with about things that my husband could not witness / hear. Some are male & some are female. IMO, certain female friends are very damaging to the marriage. By the same token, some women have had lesbian affairs. Doesn't the "friend of the opposite sex" thing depend lesss on the gender and more on whether the friend is a mutual friend of the married couple and that the friend respects the marrital realtionship?