Pornographic movies available in the rooms of some of America's best known hotel chains have caught the attention of conservative activists.

A coalition of 13 conservative groups -- including the Family Research Council and Concerned Women for America -- took out full-page ads this month urging the Justice Department and FBI to investigate whether some of the pay-per-view movies widely available in hotels violate federal and state obscenity laws.

Activists chose to target the hotel industry in part because of the well-known brands of corporations that cater to family vacationers.