Because Americans spend more time at the office than practically any other place, coworkers are bound to forge close relationships. And often, these friendships can blossom into something more.

According to a 2003 American Management Association survey, 12 percent of managers admitted to dating a subordinate. These are the relationships that are risky for business. A scorned subordinate might decide the relationship wasn’t consensual after all and file a harassment claim. Other employees might feel their coworker is getting special attention and allege favoritism.