In the real world its NOT OK.  In a trusting relationship  if there is nothing to hide it would be ok as long as you're not sneaking around to be with this other person. There is a fine line Men and Women can not be friends without a hidden motive, That is what has been fed to us. There is life before marriage and who's to say that Girl-Fried or family member is safe to be around. Strager things have happened.