More than half of all workers have experienced sexual harassment. While the majority (about 80%) are women, both men and women can be victimized by unwanted sexual attention in the workplace. Sexual harassment runs a continuum from periodic comments to daily campaigns of victimization. Serious sexual harassment undermines workplace productivity, harms victims and bystanders, and can even lead to serious mental health conditions such as post-traumatic stress disorder (PTSD). Understanding what does and does not constitute sexual harassment is the first step toward combating this source of workplace misery.