Probably not, but it does redirect the mating impulse "harmlessly" away from actually interacting with other people. It probably also reduces the attractiveness

Probably not, but it does redirect the mating impulse "harmlessly" away from actually interacting with other people. It probably also reduces the attractiveness of getting with ugly people, relative to pointing your browser to some tube site. That's a problem that extends beyond pornography and the sex impulse. Watching people have a life on YouTube even displaces having a life.