In the descriptions of Mars, Jason, you should be sure to note the unusually high Princess population.
While we're waiting on DBRP and JD sourbook, anybody interested in this genre really should check out Gareth-Michael Skarka/Adamant's MARS RPG of Planetary Romance. It is D20 and I'm firmly of the opinion that d20 sucks. But he did a great job threading the maze to create a Mars that feels like Barsoom and other pulp Red Planets, but doesn't require the ERB stamp of approval. It would be very cool if there could be some kind of arrangement to produce dual stat BRP/d20 adventures.