What difference is it from the hardcore images posted inside threads?
I find it is hard to avoid the banners because they're on every page, even if you're sending a PM, and especially if you use 'show unread posts' and 'show new replies to your posts' links - if there are no new posts or replies then your phone/iPad screen mainly has two footers full of SP images.
It's easier to avoid when looking at a review or one of HP's grusome galleries as you can choose not to read the review or to quickly scroll past the images with your hand over the screen or re-angling the screen until you've scrolled past them. This method is not ideal for every single page though.
I don't mind seeing the images at the bottom when I'm alone or not in a public space, in fact quite the opposite, hence a feature to toggle the footers/banners on or off would be ideal.
Hope that makes sense.