Would you feel more uncomfortable sitting on a plane next to a woman reading 50 Shades of Grey or a man leafing through a Playboy?

Because I'm taken aback when I hear a woman talk about how she's reading (or has read) 50 Shades of Grey, and is seemingly unembarrassed to do so.  (Note: for those unaware, this is a romance/erotica book that has uniquely achieved mainstream status, and New York Times bestselling success, despite what I am told is fairly uninspired writing.)

I guess I don't understand the difference between visual and textual pornography.

They are both created to do the same thing - each targeted to a different gender, based on biological differences.

...but the Playboy seems worse, right?