Sexual harassment is about sex. Sexual harassment is most often about power. It rarely has anything in common with normal sexual or romantic relationships. Women of all types and ages get sexually harassed irrespective of how attractive they are or how they are dressed. Whether or not romance belongs in the workplace, true romance chivalry and comradery are the products of consensual, mutually desired human interaction.
Sexual harassment is the opposite.
It is a tool for the exertion of power by one person over another who for any of a variety of reasons is seen as vulnerable and unable to effectively fight back. Most legal definitions of sexual harassment are straightforward, at least by legal standards. Sexual Harassment law is very new. It was not until 1986 that the U.S. Supreme Court issued a decision firmly recognizing the concept. As a result, we have only about fifteen years of experience with sexual harassment law and it is still being refined.