HUSTLER TO ROB KARDASHIAN REALLY WANNA SCREW YOUR FAMILY?

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Rob Kardashian and Blac Chynaare getting the chance to star in a brand new Kardashian sex tape ... with an earning potential of 7 figures. 

TMZ obtained the letter sent from Hustler honcho, Larry Flynt, to Rob and Blac -- asking them to consider shooting a video for the company's celebrity sex tape division. 

Flynt says Hustler is looking to be a major player in celebrity porn ... and thinks R&B's fan base will benefit all involved.  

He promises they could be looking at earnings of a million dollars or more. 

Remember ... Ray J and Kim are STILL cashing checks from their 2007 sex tape... maybe the family business ain't so bad.