Many Filipinos, however, thought it was a harmless kiss intended to be fun.
The 73-year-old Duterte, whose critics have labelled him a misogynist and say his comments are derogatory and demeaning towards women, dismissed the kiss as just a "gimmick" to entertain supporters at a meet-and-greet event in Seoul.
Social media was abuzz with photos and videos of Duterte on stage before a crowd of Filipinos on Sunday night, when he asked an unidentified audience member to kiss him in exchange for a book he was handing out.
The woman, who admitted she is married and appeared excited to see Duterte in person, agreed.
Duterte then told the cheering crowd of about 3,000: "Don't take it seriously. It's just for fun, a gimmick."
State-run Philippine News Agency identified the woman as Bea Kim and posted a brief video interview with her on its Facebook page.
"There wasn't malice in it," she said. "For me, for him, it didn't mean anything."
Duterte's controversial remarks about women include numerous jokes about rape and have incensed activists and foreigners, most notably, Chelsea Clinton, the daughter of former U.S. President Bill Clinton. But none have dented the hugely popular leader's domestic support.
Women's rights advocates in the Philippines recently launched an online #BabaeAko (I Am A Woman) campaign to send a message that they were not taking Duterte's "sexist" statements sitting down.
"The fact that you thought that kissing the woman would entertain people...that's something really sick."
Opposition Senator Risa Hontiveros said that even though the kiss was consensual, it was a "grave abuse of authority".
Anna Pinili, a churchgoer who considers herself a devout catholic, said Duterte had good intentions, but could have handled it better.
"He should have kissed her on the cheeks instead," she said.
Father of two Raymond Pascual said people were making too much of a deal of it, and he thought it was just a "simple kiss".
Making the rounds also on social media was a spoof photo of the same kiss, but with the woman replaced by superimposed image of China's President Xi Jinping, in an attempt to poke fun at Duterte's high regard for his Chinese counterpart.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
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