It's because they have noticed that lately men enjoy a beautiful landscape and her female brain, for all its lack of complexity, just assumes that if she poses with her weird female "ass-out" pose somewhere in the nature, then she will get points not only for her ass, but also points for the beautiful landscape.

It doesnt cross their minds that men with brains might stop and think how shallow and inauthentic it is to go to a beautiful landscape and instead of enjoying it to start taking a photo session.