Some unlikely Atlanta women are spending hours on the Internet looking for child prostitutes, but not for personal gratification. They’re volunteers who are monitoring websites that advertise children under categories such as “escorts” as part of a new front in the war against sexual trafficking. “We have found every quarter an exponential increase in the number of girls being exploited,” said Deborah Richardson, executive vice president of the National Center for Civil & Human Rights. “One reason is the internet. Anyone can sit at home and order a young girl for sex as easily as ordering a pizza.” And just as a customer can specify pizza toppings, children can be ordered online by skin color, hair color and age, she said.