Sentence:  A <WSD>quid pro quo</WSD> complaint typically is lodged by an employee who has been denied opportunities because he or she refused a perpetrator's sexual advances or by an employee who has been denied opportunities because another employee obtained those opportunities by submitting to a perpetrator's sexual advances. 
Meaning of the word marked with <WSD> tags:  Sexual harassment in which a person in a workplace implicitly or explicitly requires  sexual favours in exchange for something.