TALK about getting caught on the job.

A United Parcel Service driver in Oklahoma City is in hot water with his bosses after a prostitute posted a picture of their afternoon encounter in the back of a company truck.

Far from being discreet, the revealing photo showed the woman wearing an unbuttoned UPS shirt and was accompanied by the words: "Look at my naughty time from yesterday."

The prostitute posted the picture on a local online exchange this week, apparently to promote her members-only website. Identifying herself as "happiness consultant Mary Ann" she went on to graphically described her interlude with the driver.

She also told how more explicit photos had been posted to the members section of her site.

The original post, which has since been taken down, was spotted by JohnTV.com, a website devoted to "exposing prostitution" in Oklahoma City.

Things escalated from there.

Local station KWTV News contacted global delivery service UPS and they were not amused.

A spokeswoman said executives were outraged and the company was moving quickly to track down the identity of the driver involved.

Susan Rosenberg said: "It disrespects UPS drivers and customers. This is not behaviour we would ever condone for anyone, let alone for our company. We want to assure other drivers and our customers that this will be fully investigated."

Brian Bates, founder of JohnTV.com, said: "What really shocked me is that a driver would put himself in this position, no pun intended, and then allow the pictures to be posted publicly."

The woman's website shows pictures of her in various costumes, including a Christmas-themed one, and includes the description: "I am a confidant (sic) woman who just loves to play ... with a great attitude, and some mad skills."

She has so far decided not to talk to local media.