As someone who doesn't mind looking at "black-sex-picture-free" links, I checked it out and I got a "cannot be displayed". I got the same thing when I tried just the domain, so I can only speculate as to the reasons your text would show up there.
Have you been using PPC advertising lately? If so your ad containing that text might have been displayed on a site that displays such ads ala google's AdSense and Overture's content match. That page might have been crawled while it was displaying your ad (and text).
How original is that text? Is it possible that someone selling the same products could produce the same sentence by using manufacturer's descriptions?
Have you posted a link to your site with that description to FFA sites, directories, etc.? If so, this site may be using syndicated ad's, content, links, etc. from somewhere that you submitted your link to.
These are just a few guesses that came to me. Being able to see the site this site would help, but like I said, it seems to be down.
You are obviously concerned about it, and rightfully so, keep looking into it. Try a google search for the domain name and see what you find. Go to
www.dnsstuff.com to find out more about the domain.
Good luck.