A UPS driver who decided to spend his lunch break having sex with a prostitute in the back of his delivery truck will probably regret his decision — once the company tracks him down, that is.

Photos of the afternoon delight surfaced online this week after they were uploaded to the Escort Client Community Information Exchange by the hooker herself as part of a promotion for her members-only website.

"Look at my naughty time from yesterday," wrote the woman, who identified herself as "happiness consultant" Mary Ann.

JohnTV.com, a website devoted to "exposing prostitution" in Oklahoma City, says it believes it has identified the woman behind the special delivery as one Tiffany Fay Hawkins, a local prostitute better known by her stage name, Tiffany Cums.

"She was touting much more explicit photos of this encounter on a version of her web site that is locked away and it's only for members," JohnTV founder Brian Bates (real name) told News On 6.

A UPS rep who spoke with the news station said the incident would be "fully investigated" and the driver will likely be terminated.

Incidentally, in her online profile, Cums says she's a "sweet & sassy Okie MILF" who is "very easy going" and "discreet."

[screengrabs via JohnTV]