It took me fifteen years to see a copy of the single - and of course I bought it when I did. It turned up during a record fair. I never saw the single before or after. It can be considered quite a rarity, then.
My collection: 7" single no. 3158
Found: Record fair, Utrecht, November 27, 1999
Cost: 2 guilders
Tracks: 'Dr. Sex' / 'Snake'
Download: here