Given the shame they harbor about their lifestyle and the fear of being arrested if they talk, it's no surprise that drug addicts and prostitutes are often the targets of sexual predators.

"In general, this is a vulnerable population; perpetrators of sexual assault pick victims who won't tell," said Jill Morris, communications director for the Pennsylvania Coalition Against Rape.

Rapists often pick those under the influence of drugs, Morris said, because they may not have "the best reasoning abilities to protect themselves and they, like prostitutes, are also more likely afraid to contact police because of the fear of legal repercussions for their own activities."

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