A cheeky orangutan posing for pictures shocked tourists when he shook a woman's cleavage.

The five-year-old primate named Nhong made a cute heart shape when he joined his arm with the visitor to Safari World in Bangkok, Thailand, on Sunday.

But within moments he had backslid into his naughty ways, creeping behind the woman and cupping both her breasts while jiggling them with his fury hands.

The prank had onlookers in fits of laughter but animal rights groups have raised concerns that bosses are exploiting Nhong's party trick to make a packet - with holidaymakers paying 1,000 Baht (22 GBP) for a minute of action with the ape.

Onlooker Gabrielle Frost said: 'It was funny. The orangutan seemed to be enjoying himself. He liked it when people laughed.

'I didn't pay for a picture with him but I watched other people. They all saw the funny side when he kissed them and felt their bodies.'

The orangutan lives in an enclosure at the Safari World zoo in the Thai capital. One of his roles is to stand with tourists as they have pictures taken.

However, he has learned the amusing trick of touching women's cleavage and kissing them - with encouragement from the handlers and other visitors.

Willing women are even flocking to the zoo to be groped by the ape because of the popularity of the videos on social media.

Despite the popularity among locals, animal rights groups have raised concerns about orangutans being used for the entertainment of tourists in zoos in Thailand.

Suddan Wisudthiluck, from the Thammasat University, Anthropology Department, said that animals are 'seen as friends or family members'.

But animal rights groups including PETA have previously called on the photo sessions with orangutans to be banned as they 'humiliate and exploit' the creatures.

The said the zoo was 'hell on earth' for the ' intelligent and social animals'.