I have seen the Star Trek documentary, and it is one of the scariest movies I have ever seen...a porn version would be nothing short of brilliant.

What's great about the Trek doc is that they interview the stars about their most way-out fans as well...which means if said fan didn't agree to participate in the movie, one can still include an anecdote about their bizarre behaviour, like the guy who just mails brochures into the Star Trek production office...