When I was watching this I was thinking about writing some kind of review being like 'It tells you a lot about this documentary that despite all the ridiculous S&M stuff, the most upsetting thing is Bob's slow battle with CF' but then they showed him hammering a nail through his bellend into a plank of wood and I changed my mind because that is definitely the most upsetting thing.
This documentary is such an interesting and heartfelt look into Bob Flanagan's life though, it will have you laughing and then crying and then vomiting in quick succession.