The pair had arranged their car tryst by a square in the Umbrian town of Gubbio.
But, feeling a little cold despite the sparks between them, they put the car heater on, Corriere del'Umbria reported.
Perhaps the passion got too much for the heater too – the fan short-circuited, causing a fire inside the car.
The lovers were forced to flee the vehicle and call the fire brigade.
In an attempt to cover their tracks, they tried to claim that the car had been stolen and deliberately set alight.
But the police didn't buy it and the pair were reported to the local prosecutor. They now face charges for creating a false public alarm.