People are less likely to feel ashamed of something if they believe its "normal", and the rise of internet porn has certainly helped normalize sexuality. Spend a few minutes on the web and it becomes pretty obvious you're not the only one interested in sex, let alone any particular flavor of sex. Porn isn't the only thing that has taken the shame out of sexuality, but it's a pretty big one.

BTW - I would love to see your video.

Propensity for violence is cultural. Japanese culture happens to abhor violence while American culture celebrates it.