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SAN ONOFRE (Reuters) - A parade of 30 topless porn stars riding surfboards at San Onofre will go ahead, Rangers said Monday. Park officials gave the "Boobs on Boards" parade the green light, saying there was no legal reason to stop it despite concerns by Mayor Murphy that granting it a permit would add legitimacy to the event. The event, part of an "Erotica Expo" organized by local promotor Seymour McAllen, will proceed midday Monday. Rangers earlier said they did not regard the parade of leather-clad porn stars as indecent. "In the opinion of the rangers, given the standards of decency observed in this day and age, a female being topless in the surf on a weekday at San Onofre will not in itself constitute an indecent act," Ranger Hal Dairywimple wrote in a letter to Mayor Murphy on Sunday. However, the behavior of the participants during the parade might still attract the attention of Rangers, he warned