I don't know, the first one I ever saw, the one with Cody Lane, turned me on like mad. But that one actually looked really real and I had never seen one of these lame videos with big fake dicks. I only downloaded the last clip, with the cumshot, because it looked like a must-see. When I watched it I was turned on like mad, I had no doubt it was real, the cum had a realistic watery translucent look to it and it was the biggest load I'd ever seen, but only by a bit, so I assumed it was real.
Plus one of my favourite cumshot clips ever, the load is nice and runny and starts coming out kind of more like a constant surging flow with spurts, just like that one was.
Then I saw a few more and said... "fuck that".