Where the young men are: "ComScore also collects data on Internet pornography-viewing habits, although that was not part of the online publishers' report. According to the company, more than 70 percent of men from 18 to 34 visit a pornographic site in a typical month, and those men make up 25 percent of the visitors to such sites. They are 39 percent more likely than the rest of the Internet population to visit the sites, said Graham Mudd, an analyst for comScore. "