A dynamic quartet of sexual sistas, a paean to the fire down below, the added-at-no-extra-charge attraction of four similarly beefy (though uncredited) cable-thick studs, one smallish room, a switch of the couch or bed (keep the picture, though), a minute or two of jokey banter, and then get dowwwwn.  The men pretend to be uninterested, but they always come around - though not in the end - to the wily, sophisticated charms of these strong women; especially Obsession, who opens with the irresistible, venomous charm of a snake, and Coca, who closes things down with a diva's operatic sex drive.

The sex itself, while admittedly impressive in its... zeal, is somewhat unimaginative.  Let's just say it doesn't push the envelope.  But this is, and should be, a relative quibble; akin to watching a favorite ice skater do a slightly safer routine, but one well-known and performed confidently and to perfection.  Or like Harrison Ford's acting: safe, sometimes downright boring, but solid and curiously entertaining anyway.  You get the idea.