35.
Hun. You know what he looks like, or anything? If so, Then you can easily go to whoever is in charge of discipline, and tell them who it is, and what they have done to you. Weather or not you don't like telling on people, sexual harassment is something that shouldn't just be pushed aside, especially if it's happened more than one. It's only going to go downhill from there, so you might as well 'tattle' and get it over with.
I may sound blunt, but the same thing happened to my best friend last year, and she was able to take care of it by going to discipline and telling them what happened.
Bring your friend/the person you talk to along with you to serve as part of your witness, along with being a victim of it herself.