All the Truth...
The number tatooed on Frank's thigh is neither a brand of condoms, nor the number of Frank’s lovers. It's a brand of a Cologne very popular with Gays in the 70's
The True story of 4711
In 1796, during the French occupation of Cologne, the French commander in Cologne Général Daurier, ordered the consecutive numbering of houses.
Wilhelm Mülsens' house received number 4711, which then - in 1875 - became a registered trademark
This Cologne still does exist, we bought a few bottles in July 2004 for all the cast members!