A 66-year-old German tourist, annoyed by stringent security at Manila's airport, dropped his pants before walking through an X-ray machine, newspapers said Monday.

Authorities were not amused.

Instead of boarding a flight to Frankfurt on Friday, Hans Jurgen Oskar von Naguschewski was detained after police filed a complaint of lasciviousness against him, the Philippine Daily Inquirer and the Philippine Star newspapers reported.

"He must have been annoyed that he was asked to walk through the X-ray twice, so he took off his pants," airport security chief Angel Atutubo was quoted saying.

Oskar spent the weekend in police detention and was to face the prosecutor later Monday. If convicted, he could face six months to six years in jail.

"He actually didn't say much, unlike Filipino passengers who would talk a lot. He was clearly irked and he showed it by disrobing," the Inquirer quoted police Supt. Atilano Morada saying.