Sexual harassment, in law, consists of deliberate and unwelcome sexual advances, unwanted requests for sexual favors, and certain other offensive conduct of a sexual nature. Sexual harassment may be committed by men or women in many different roles, such as that of boss, client, co-worker, fellow student, military superior, or teacher. However, a large majority of cases involve the harassment of women by their male bosses or fellow employees. A number of countries, including the United States and Canada, have laws against sexual harassment.