If entertainment magazines can be using photos of sexy ladies (and men) as their front covers just to make sales, then you should know that using such images for your entertainment Facebook page will definitely make some sense too.
Of course, you have to be careful when using such images, so that Facebook won't delete your Facebook page without prior notice. Don't be scared though, in as much as the private parts are covered in the sexy photos.
You can check out the Beautiful Sexy Hot Girls Facebook album here for sexy photos you can use as Facebook covers.
The photos are free to use. No watermark!
If you know other sources you can recommend, kindly share via comments.