A Russian man allegedly made hoax calls to police about a bomb in a public spa because he wanted to see naked women being evacuated.

Police say it was women's day at the bath house in Ulyanovsk, when the hoaxer rang up with a bogus warning.

Officers say he had hoped the women would run out into the street still naked, but was disappointed to see they had all got dressed first.

They claim the 33-year-old later admitted his motive was to see naked bathers being evacuated.

He faces up to three years in jail for deliberately giving false information about an act of terrorism, reports Pravda.