Because the average porn watcher is still fascinated by how they can make their pee-pee's shoot out white stuff. The fact that you can make it shoot that white stuff onto the girl and make her squeal is even more interesting.

Seriously, faggotry knows no bounds. It's not about degrading women, it's because they like to masturbate while watching other guys masturbate. They'll post here and say "Oh I'm watching the hot chick get plastered," but they really have one hand on the remote staring intently at the guy rubbing his cock so that they can time their pop to the performer on the screen. They'll even pause the flick so they can "catch up" to him. It's all about being infatuated with big cocks, has nothing to do with the woman. They'll deny it, just like people claim they sub to Playboy for the "articles."