Ok, I can believe that they would make a sex tape, but what I do not believe is that white trash this egregious would possibly have the self control to wait for years to release it if they did.
I guess it's possible they thought it would be funnier if they waited until Ralph and May got married, which it certainly would be, but the idea that a gaggle of retards like this wouldn't have let the fact a sex tape existed slip at all up to this point seems a little outlandish.
Props to them though if they really did manage to keep a lid on it this long just for effect.