The reference to softcore porn was not about how much skin is being shown. It was about the type of film making JJ is engaging in these scenes. It serves no purpose in the story, therefore, we are just looking at her like a piece of meat. Therefore, we are engaging in filmmaking meant to make to make us excited. Hence, softcore porn.
It isn't the amount of nudity, it is the useless, gratuitous shot that does not build character, it does not move the story along, it does nothing for themes of the movie. It is just meant for little 12-year-old boys to pleasure themselves.
Why are you so interested in how 12 year old boys pleasure themselves?