Character posters are nothing new. And posters where a cast member points their butt at us is also fairly common. But we have to consider ourselves extra lucky and civilized when that cast member is a guy.
This new Captain America: The Winter Soldier poster provides a wonderful example. In it, we see The Winter Soldier himself (without a mask, even), and can see that they don't call him a badass for nothing. He clearly wants us to check him out, but he also wants to make sure we don't get too comfortable. He has stuff to do. Stuff that doesn't involve you people. But before he gets out of the way of that falling Helicarrier, go ahead and have a little gander.