"In short, porn sites cope with astronomical amounts of data. The only sites that really come close in term of raw bandwidth are YouTube or Hulu, but even then YouPorn is something like six times larger than Hulu."
Probably. Netflix has the big constraint of availability that only extends to the US. Porn is global. Even though the US has a above-average bandwidth usage (guesstimated) it's still only a small(ish) drop in the global network.
