Leave it to Penthouse to design the perfect solution to six player canasta: three matching decks with different-colored backs.  The white deck comes in a white wrapper and features girls and more girls.  They come two and three to a card and they explore one another thoroughly, sometimes with the help of sex toys.  The black deck comes in a red wrapper and features copulating couples of the procreative variety.  The six of diamonds (which adds an extra girl) and the jack of hearts (which ads an extra boy) are the exceptions to this rule.  Penthouse fantasies which span the ages as well as the imagined future are depicted with the usual Penthouse penache.  A fair sprinkling of sex toys spices things up.  More conservative gamesters will probably want to play solitaire with the solo girl deck, which has a red back and comes in a black package.  All three decks depict gorgeous girls (some in black-and-white, though most are in color) and sumptuous settings.  The plastic coating will insure durability should the drinks (or other fluids) spill.  I would recommend that you tell the customers to buy multiple decks, in the event that sticky-fingered opponents leave the table with a card or two up their sleeves.