MANILA, Philippines -- Senator Aquilino Pimentel Jr wants the Senate to investigate what he called the "obscene exercises" of a college fraternity and the possible sanctions that could be slapped on the group.

Taking the floor on Wednesday, Pimentel lambasted what he called the "wanton disregard of the rules of decent society" by male members of the Alpha Phi Omega (APO) Fraternity, who staged an ?oblation run,? in which naked fraternity members jog to drumbeat a cause, around the University Belt in Sampaloc, Manila Tuesday.

The display of nudity, Pimentel claimed, violated the country's anti-obscenity law, for which he said the APO may be held liable and sanctioned.

?What redeeming social value does displaying the male genitals to prurient or innocent audiences, young and old, possess to justify it?? he asked.

Pimentel asked the Senate committee on education to conduct the inquiry and find out what justifications, if any, made the APO?s tradition acceptable.

"And if there are none, to sanction the parties responsible, including the university authorities, for failure to exercise their bounden duty to see it that the laws and rules of this country prevail," he said.

"I am certain that this call may elicit the ridicule of those who disagree. My only request is that the brick batters should confine throwing their brickbats against the issues that I raise, not against me as a person," the senator added.