Sex at the office was a fringe benefit back in the “Mad Men” days. Not now. But there are still a few offices in existence where this venerated practice is still in full swing. Like the office that Mr. DeSergio runs. Only big-titted girls can get a job at his company where the dress code requires that all females be un-clad in tight, low-cut and too-short apparel. Demmi Valentine is the kind of girl he hires. Today, she's getting a little something extra in his office as a pre-Valentine's Day gift and it ain't so little. Now Miss Valentine isn't a flaunter. She doesn't lean over Mr.