The only live male in the film is a male cat that appears in the background inside the kitchen as two of the girls are talking outside the house.
Film has an all-female cast. The only men seen in the film are shown in a picture in the cabin scene.
The people in the picture in the cabin scene were part of the film crew. The director appears in the picture and then again as a corpse in a later scene.
Film was inspired by "The Descent" and contains several easter eggs that ties in with that film.
The female characters all wear heavy winter clothing throughout the film. No one ever dresses in the tight jean shorts and half shirt shown in the poster art. That image was used to potentially draw in a bigger male audience.