The comments from a senior member of Prime Minister Shinzo Abe's ruling party provoked criticism from Seoul, just two weeks after Tokyo offered an apology and a one-billion yen (USD 8.5 million) payment to surviving South Korean women under an agreement both nations described as "final and irreversible".
The plight of the "comfort women" -- a euphemistic expression used in Japan and South Korea to describe them -- is a hugely emotional issue that has for decades marred ties between Seoul and Tokyo, which ruled the Korean peninsula harshly as a colony from 1910 to 1945.
Liberal Democratic Party lawmaker Yoshitaka Sakurada initially made the comments during a meeting with 10 other LDP lawmakers Thursday morning.
"They were professional prostitutes," Sakurada told the gathering, according to Jiji Press, referring to wartime sex slaves from Korea.
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"That's business," he added.
Sakurada, also a former senior vice minister of education, culture, sports, science and technology under Abe, said further that Japan "is too much fooled by propaganda," an apparent questioning of the accounts of the women and other evidence.
Immediate confirmation of the reports was not available. Calls to Sakurada's office went unanswered.
"We should not respond to every remark by a lawmaker," Chief Cabinet Secretary Yoshihide Suga, the government's top spokesman, said before the reported retraction,
He stressed, however, the importance of "sincerely" fulfilling the accord with South Korea.
Sakurada's initial comment likening comfort women to prostitutes drew a sharp rebuke from South Korea.