Usher dating his manager
Add in that you write the schedules, assign stations, issue reprimands and write-ups: In other words, you control the situation. At some point in your career, you may find it very tempting to have a drink, then date, or (in corporate language) fraternize with your employees. (There are no secrets in the restaurant business.) Eventually, someone will confront you.
It might start by accidentally meeting after work when you've stopped in for a drink. Panic will set in because you will have no idea what to do about it.
In short, it can be one of the most serious threats to a restaurant manager's career.
Many food service environments have all the "wrong" ingredients; a server/bartender staff made up of charismatic employees, late nights and/or long hours, and a limited social life outside of work.
To make matters worse, the employee could go to your general manager or corporate manager and accuse you of sexual harassment. Even if your relationship was totally consenting, you will most probably lose the sexual harassment lawsuit.
When I was vice president of operations of a regional restaurant chain, this sort of scenario played itself out twice.