The guy in the video noted that internet porn (access to unlimited videos on demand) and potentially watching more than one simultaneously is why modern porn is affecting us more than pictures/magazines of the old age.
Some quotes from an article I found (if anyone cares):
Instead of being in a situation where we want to meet others, we instead get more pleasure from fake people. This is because of the release of dopamine that happens in this situation. Soon the lure of porn & masturbation becomes even more compelling than going out and trying to meet women for sex.
The instant gratification porn provides means we are more likely to stay in and masturbate, instead of going out into the real world.
Edited:
Ops, just lost. Accidently got into this thread and lost control.