Sex behind the wheel can distract young drivers, leading to over-speeding and even a crash in some cases, says a new study.
According to researchers from the University of South Dakota, there was a fair amount of sex - including intercourse - while driving among youngsters in South Dakota.
The findings - which involved 195 men and 511 women - showed that while 33% of men and 9%of women had sex while driving, 9% of men and 29% of women had sex while as a passenger.
Sexual activity lasted 1-10 minutes for 42.7% of the respondents.
About 49% were travelling at a speed of around 100-130 km per hour during sex, it added.
The most common driving errors reported were speeding (37.8%), drifting into another lane (36 percent) and letting go of the steering wheel (10.8%).
Fewer than 2% nearly had a crash, said the authors.
Reported by Star Tribune, the study appeared in the journal Accident Analysis and Prevention.