"Extreme" is such a subjective concept; it means different things to different people. You may think the stuff you want to watch is "extreme," but your point of reference is yourself, your experiences, and your own hangups those have built up over time. Could you let us know the exact content you're looking to find?
Nobody will be shocked or judge you, we promise. Every last one of us has a kink of some kind or other, and I think they intensify as we get older and our inhibitions and anxiety start slipping away. You're going to get responses here from fellow fappers that think your version of 'extreme' is vanilla boring stuff.