[header] How to sue for sexual harassment [title] Gather evidence of the sexual harassment. [step] Before you report sexual harassment at any level, you need to have documentation that it's occurring and that it is interfering with your ability to do your job. [substeps] Two types of sexual harassment are recognized by anti-discrimination laws: quid pro quo harassment and hostile work environments. 
The type of evidence you need will differ depending on which type of harassment you're experiencing. Consider keeping a journal or diary in which you write down each instance of harassment as soon as possible after it happens.