from www.bostonherald.com – Former Red Sox mound man Roger Clemens, who is being slagged as a slacker in the sack in a XXX-video by his ex-paramour Mindy McCready, took to his Twitter page to insist that all his man parts are “still working great.”

McCready – the “Celebrity Rehab” trainwreck who continues her battle with Vivid Entertainment over “Baseball Mistress,” a tape she claims was stolen from her home – dishes in the kiss-’n’-tell vid that Rog was no Rocket in the sex department.

The country singer, who allegedly took up with Mr. Cy Young when she was 15, says Clemens was OK in bed, but he did have “a lot of problems” with erectile dysfunction. Which, as you know, is a side effect of steroid use.

Clemens, who went before a congressional commission about his alleged juicing, lashed out on his verified Twitter page: “It’s amazing what some will say to make money off of another. Hey here’s a thought . . . ever tried working for a living?”

Nine minutes later, Rog hurled a P.S. out to his fans who apparently had read about Mindy’s revelations: “and BTW . . . I’ve taking(sic) great care of my body and, to this date and time, all the pipes on this body are still working great. Thx for asking.”

But “this date and time” aren’t in question . . .