The 23-year-old Egyptian man and 40-year-old Tunisian woman were caught in the act by a police officer on the outskirts of Milan on Monday.
Quite apart from decency laws, the pair chose a particularly bad time for their roadside fling, with authorities on alert for breaches of the virus lockdown.
The pair were accused of ignoring a quarantine rule which bans two people from being in the front or back of a vehicle together, according to news agency ANSA.
It is not clear whether the couple will face further action, but authorities have been keeping a wary eye on all road vehicles in order to enforce a ban on travel.
Italians are only allowed outside to buy food, give or receive medical care, or travel to work if absolutely necessary.
Despite the ample opportunities for indoor entertainment, the couple were caught in the act on a road in Mecenate near Milan which has been heavily hit by the outbreak.
Elsewhere, a family who were relaxing on a lawn were ordered to move by police in San Donato Milanese near Milan today.
The region of Lombardy, which includes Milan, has had the largest number of cases in Italy and hospitals in the northern province are struggling to cope.
Doctors have described how medical centres have become ‘overwhelmed’ with medics forced to make life-or-death decisions about intensive care.
There are fears that the health system in the poorer south of Italy would be totally unable to cope if the outbreak occurred on the same scale there.
Italy is now requiring anyone entering the country to self-isolate for 14 days unless they are only stopping over for 72 hours or can prove that they must go to work.
The latest figures yesterday showed 3,526 new cases taking the total to 31,506. The number of daily cases has shown signs of steadying in recent days.
The Italian death toll rose by 345 to 2,503.