What Do These Four Book Covers Have In Common?

Now I don't particularly mind them, in fact I do like that Anchor and Storm cover, but they are kinda close to the knuckle aren't they?

Like I said to Bam, I wouldn't be caught dead reading these books in public, so it's probably just as well they are in e-format, no?

As pornographic (yes they are) as some of these covers are, I bet they're selling like hotcakes though.

If these come out in print, I suspect EC will have to change the covers altogether. No self-respecting woman is gonna read any of these books on the train, or any other public (heheh, I just accidentally wrote, 'pubic') venue.