Over a million motorists think about sex rather than the road ahead and millions more who don’t indulge in intimate thoughts are worrying about work or thinking about their families, a survey said on Thursday.

Research from car insurer More Than found one in five drivers admit to concentrating behind the wheel less than 75 percent of the time, with 1.2 million thinking mostly about sex.

And sex wasn’t the only non-traffic thoughts motorists have. For 3.2 million drivers work was the main focus and for 2 million more it was family issues that dominated.

"Unsafe habits can be unlearned just as easily as they can be learned, but first, drivers must recognize the risk they face by not concentrating on their driving," said Lisa Dorn, director of Driver Research at Cranfield University of the findings.

The study also revealed the things most drivers’ hate.

Topping the list were tailgaters (28 percent), lane hoggers (20 percent) and drivers who cut in (11 percent).

Other road users who drove too fast and those who drove too slowly were also rated on 11 percent.

The research carried out by Sky Living for More Than questioned 4,497 adults in June, 2006.