These days if you are the victim of sexual harassment at work there is a good chance you will be getting some money. Many companies have insurance policies that cover things like sexual harassment. And with the proliferation of cell phones and the use of email and text messages there is usually ample proof of the harassment. If the person at work harassing you is a supervisor the company has strict liability. If the person is just as co-worker you must report the conduct to management before there is any liability.
It is very important to speak with an employment lawyer as soon as the harassment is taking place. You will want to get evidence and also there are strict time limits for filing a complaint of sexual harassment with the Illinois Department of Human Rights ("IDHR"). The key thing to keep in mind is that the burden of proof is on your to prove you were the victim of sexual harassment. The company doesn't have to prove or disprove anything until you first prove your case. An experienced employment lawyer can help you get the proof you need.