Video footage shot on a mobile phone by Danielle Pearson begins with the family's car passing through the monkey enclosure.
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As the little creatures scatter all over and around the car at Knowlsey Safari Park in Merseyside, the excited screams of children in the back seats can be heard on the audio of the footage.
But the kids' joyous screams soon change to something a little more concerning as two of the randy primates begin mating right in the windscreen.
Initially one monkey leaps onto the car, before turning its head to look at its mate, then bouncing back to the ground.
The female baboon appears nonchalant as she sits on the bonnet of the car
Things soon turn very intimate between the randy primates
As the baboons appear to engage in a little kiss-chase, they then leap back onto the car before getting very, very intimate indeed.
The children can then be heard screaming "naughty monkey", as the monkeys enjoy their passionate embrace in full view of the family.
Children in the car can be heard screaming "naughty monkey"
Danielle Pearson wrote online: "Kids day out to Knowsley Safari Park got a bit awkward"
Danielle can be heard screaming in disbelief at the scene unfolding before her and her children's eyes.
Uploading the hilarious footage online, she wrote: "Kids day out to Knowsley Safari Park got a bit awkward".