A kiss by Philippine President Rodrigo Duterte on a Filipino woman's lips while on an official visit in South Korea sparked anger and jokes yesterday, as feminists denounced what they called his "perverted way" of taunting his female critics.

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.