I'll let the ad speak for itself.

I'm not a prude by any stretch of the imagination but when a mainstream-Americana company like Burger King chooses to put such a degrading image of women out there as a way to peddle their junk food to the public, I feel the need to say something.
They have the right to be tasteless and sexist... And I have the right to tell them they will not see a dime of my money as long as they are using these types vulgar images and tactics in their advertising.
Please feel free to join me in giving them a piece of my mind if you share my disgust.
Burger King Corporation
5505 Blue Lagoon Drive
Miami, Florida 33126
Corporate Headquarters - 305-378-3000
Marketing/Advertising Information Requests - 305-378-7200
Consumer Relations - 305-378-3535
North America:
Denise Wilson
Media Line: 305-378-7277
After Hours: 1-800-393-3999
For those who are asking below. Why is this ad degrading and sexist in my opinion? In addition to the ham-handed caveman-level subtlety, the woman in the ad is clearly made to look like a blow-up doll.
HT to kirbybruno for locating and posting a link to this article discussing BK's lame advertising tactics in the comments below:
Burger King Blows Its Marketing Wad
In pertinent part:
Burger King's (BKC) increasingly obnoxious attempts to lure young dopes to its horrible food may have gone too far this time. The likely slightly older (but award-winning!) dopes... have come up with a print ad shamelessly evoking oral sex to peddle the "BK Super Seven Incher."
...
Gawker notes that the "only thing this ad is missing is the disclaimer that you'll actually get fewer blowjobs if you eat these sandwiches, but perhaps that's the 'genius' of advertising that we simpletons on the outside just don't get."