Participants in Saturday's "SlutWalk" walked to City Hall.
The movement was sparked by a Toronto police officer who told a group of university students in January that women should avoid dressing like "sluts" to avoid being raped. He later apologized.
Some of the Philadelphia participants say they've been sexually assaulted. Twenty-year-old Mary Reilly of Haddon Heights, N.J., tells The Philadelphia Inquirer (http://bit.ly/qYwJh4 ) she started speaking out about the issue after getting therapy following two attacks.
The Associated Press generally doesn't name people who say they are victims of sexual assault unless they come forward publicly.