All managers need to demonstrate the correct behaviors they want their teams to follow. If you don’t think a company procedure is important, the employee won’t either. This includes dating. You cannot supervise a department when you are going out with someone in that department. Everyone in the department will talk about you behind your back and you won’t get their cooperation as graciously as you did before you started dating.
A great manager will not spend time sabotaging their authority but instead will build credible behaviors establishing and solidifying their credibility.