Answer:
No. Friendships between members of the opposite sex can be completely innocent. However, if you are not including your spouse in that friendship, or you are keeping communication of any nature from them when it is in regards to opposite sex friends, you have crossed a line from innocent to not so innocent. Secrets, lead to lies, and that is a quick way to kill a marriage. Include your spouse in those friendships. Introduce them to the other person, and always include them in meetings, and tell them about conversations. If you can't or don't want to do that...ask yourself why. If this is just a friendship you should have nothing to hide. If you want your marriage to work, and you truly love and respect your spouse, keep friends of the opposite sex at a distance. Shouldn't your spouse come first, always?