Law student, Christian Gray, 20, caught the couple in flagrante delicto when he heard noises outside his Cambridge home at around 1am.
Christian, who studies at Anglia Ruskin University, immediately pulled out his camera to film the passionate couple.
‘I heard some groaning outside and to be honest I thought it was some kind of a monster,’ he said.
‘I could not really believe what I was seeing. I got all the guys over to have a look and I thought I better film this.’
The bare-bottomed man gave the student the V-sign when he realised he’d been spotted, before walking away with the woman.