In a case that could test the online pornography industry, the owners and two employees of two popular pornographic websites were charged this week in San Diego with sex trafficking and other crimes, accused of coercing several women to engage in sex videos that were posted on the internet. The owners, Michael James Pratt, 36, and Matthew Isaac Wolfe, 37, and one employee, Ruben Andre Garcia, 31, were each charged with three counts of sex trafficking by force, fraud and coercion, and one count of conspiracy to commit sex trafficking by force, fraud and coercion. A second employee, Valorie Moser, 37, who the authorities said helped recruit the women, was charged with one count of conspiracy to commit sex trafficking by force, fraud and coercion. Wolfe, Mr. Garcia and Ms.