Rhett boasted on auction website eBay: "This is a fax Michael wrote and sent
to Kylie on September 19, 1990. I have a similar, yet raunchier one I'll
keep, yet this real slice of history could be yours."
The fax reveals steamy details about Kylie and Michael's white-hot sex life.
The pair are said to have kept their relationship alive with racy faxes and
phone calls when they were apart.
Michael's mother Patricia Glassop is horrified by Rhett's behaviour and has
disowned him for trying to cash in on his brother's death.
She fumed: "I hope Kylie finds out and addresses the issue herself, because
that fax is no-one else's business."
Other items on sale include handwritten lyrics to INXS hit 'Listen Like
Thieves' and a pair of Michael's glasses.
Rhett even cruelly offers his mother a discounted price.
He said: "The frames are French and the glass is pretty thick, unlike the
previous owner. I do not think his daughter Tiger would have much use for
these, and I feel icky about dead people's glasses. Mum, you can have a 20
per cent discount."
The INXS singer was found dead aged 37, naked and hanging from a door in a
Sydney hotel room in 1997.
It is widely believed he died after a sex act known as autoerotic
asphyxiation - strangling yourself while masturbating - went wrong.