HARRISBURG, Pa. (AP) - A young man who testified at the child sex abuse trial of former Penn State assistant football coach Jerry Sandusky last summer is suing him, a charity he started and the university.

The man was called Victim 6 in court papers. He sued Tuesday in federal court in Philadelphia, claiming Sandusky's behavior was ``ratified'' by The Second Mile charity and Penn State. He's seeking at least $75,000 in damages.

Sandusky was convicted of abusing Victim 6 and nine other boys but maintains his innocence. He's serving a lengthy prison term.

Penn State has declined to comment. Messages for a Second Mile official and Sandusky's civil lawyers haven't been returned.

Victim 6 testified Sandusky called himself ``the Tickle Monster'' and grabbed him inside a university shower in 1998. His mother's complaint triggered a police investigation but no charges.