Joshua Heintzelman of Halifax, Pa., is charged with aggravated sexual assault.
Police say the 21-year-old was staying at a motel in Clifton when he offered the 19-year-old $13 in exchange for sex. The woman is from Washington, D.C., and was in the area Tuesday to support a family member who also was auditioning at the nearby Izod Center.
Police say the woman's mother became suspicious when her daughter, who never has money, bought a sweater.
The woman's family says she has the mental capabilities of a third-grader.
Heintzelman is held on $200,000. It's not clear whether he has obtained a lawyer.
Information from: The Record of Bergen County, http://www.northjersey.com