there is one video i know of a girl pleasuring herself and at the end of the video she shows the camera that she has tears running down her face.. i think there was something there where she loved what she was doing and felt like she had a purpose, however a lot of porn the girls just come off as awkward and maybe not always in the greatest place.. i mean, i definitely believe there is porn where girls enjoy themselves, but it's not always the case, so if you are just clicking around the net, there's some chance to run into stuff that seems kind of off that a person might not want to see, just unhealthy stuff... but a lot of people just do porn on their own accord, not always the result of sex trafficing and what not.
sometimes i think people film porn to make the viewer feel a little awkward, or see what they can get people watching just to see how sick people are.