Reality TV personality Rob Kardashian and model Blac Chyna have been approached to make a sex tape.

Rob and Chyna, who are reportedly seeing each other, were asked by Larry Flynt, publisher of monthly pornographic magazine Hustler, to record sexual footage, which he wants to release on his company.

The letter, obtained by tmz.com, which reads: "We are known around the globe for our top-quality videos in a variety of genres, both hard-core and soft-core. One movie category upon which we are currently looking to place more focus is celebrity sex tapes. These have proven to be both sought-after and lucrative."

"Considering your fan base and popular appeal, we think you would be excellent candidates for this type of venture and believe that, if you make such a video with us, you could earn up to a million dollars or more," the letter further read.

The relationship between the rumoured couple has caused much controversy among Rob's family, as Chyna has a son with former fiancé and rapper Tyga, who is currently dating Rob's half-sister Kylie Jenner.

Meanwhile, the model has been released from jail following her arrest for "public intoxication" and "possession of a controlled substance" after boarding a flight from Austin-Bergstrom International Airport here.