J.C. Penney Co. execs are blaming the company’s ad agency, Saatchi & Saatchi, for a fake ad that debuted at Cannes and is now on YouTube in which the retailer appears to be endorsing teen sex. The purported ad shows two teenagers in their own bedrooms stripping down to their underwear and then timing themselves as they race to put on their clothes. All this is done in preparation for the boy and girl to hang out in her basement while her mother is upstairs. The video, called “Speed Dressing,” ends with the teens heading down to the basement as the words “Today’s the day to get away with it” flash on the screen, echoing Penney’s use of the phrase “Today’s the day to…” in a series of ads it launched last year. Penney’s logo and “Every Day Matters” slogan then appear on the screen.