A tourist visiting an Indian monkey sanctuary had the shock of his life after two monkeys started having sex while standing on his head.

The un-named American tourist is being filmed when the first monkey scrambles up his side and perches on his shoulder.

The incident took place in the Sacred Monkey Forest Sanctuary in Ubud, Indonesia.

The man seems relatively calm when the small monkey clambers up his tee-shirt in Indonesia

The man poses for a friend filming the incident with the monkey perched on his shoulder

As the man holds out a banana, the monkey stretches out over his head and raises its tail

One of the man's friends shouts: 'Does he stink? Please make him take a banana out of your mouth.'

Moments later, a woman shouts a warning from behind: 'You've got one coming behind you.

Without warning the second monkey leaps onto the first and begins to copulate furiously while the partner holds onto the man's head.

The 'victim' then becomes a major source of amusement for his friends as they begin laughing raucously.

One man shouts: 'And they're doing it on your head!'

Spotting his chance, a second monkey launches himself at the first monkey on the man's head

Witnesses begin laughing as it is clear the two monkeys are copulating furiously on his head

The victim appears to enjoy the attention - even though he's about to be an internet star