A man is in custody after allegedly driving his car while drunk, naked and having sex with his also nude female passenger – while her young child was in the backseat.

The driver, whose concentration was seemingly elsewhere, missed a curve in the road, went off Mountain Highway on Washington State Route 7, and hit a tree, the News Tribune reported.

Washington State Patrol said witnesses told troopers that both the man and woman were completely naked when they left the car after the crash, which happened at about 6pm on 22 November. They also said the woman had not been in her passenger seat at the time of the crash. She was taken to hospital suffering from broken bones, but luckily her three-month-old baby in the backseat was unharmed.

The man was arrested on suspicion of felony driving under the influence, vehicular assault and child endangerment, Washington State Patrol spokesperson Brooke Bova told local media. The suspect, who has three previous convictions of driving under the influence, was taken to Pierce County Jail in Tacoma.

Last month, a coroner's pathologist was sentenced after being caught drunk behind the wheel with a half-empty bottle of vodka and a collection of human organ samples in his pickup truck. Elmo Griggs, 75, was spotted driving erratically along Indiana 67 highway in Morgan County and tried to pass another truck before coming to an abrupt halt in the middle of the road. He was sentenced to a year of probation after pleading guilty to one count of driving while intoxicated.