I've seen this guy before, but I have no name to give you. He's probably german since the films he usually appears in are GGG/John Thompson productions. These are bukkake movies, something I'm not really into, but I have checked quite a few of them out simply because of this guy (usually there's some 'standard porn sex' before the sperm thing takes off) He always wears a hockey mask (usually coupled with a 'pirate hat') He's definately one of the biggest white guys currently in porn and probably the biggest I personally know of, too bad he isn't more 'mainstream'. Except from the clip posted here, I've only seen him in one other movie that wasn't GGG (which appearantly stands for German Goo Girls) and that was a Magma film (another german, I believe, company that focuses on young looking girls, within legal age of course) Don't remember the name of this flick, but I can probably find it later. I'm guessing this clip is from the same studio.
EDIT: Kyuss, I didn't notice your post at first, but you were right.. It's not all gangbangs though (another thing I'm not that into), in some scenes it's just our hockey mask guy and a girl for a while before more people get in on it..