Lawyer Claes Borgstrom said he found it "very upsetting" that Assange, his lawyers and some supporters were suggesting the case was a smear campaign against WikiLeaks, the secret-spilling website which Assange founded.
"He's been spreading false rumours that he knows are untrue," Borgstrom, who used to be Sweden's ombudsman for gender equality, said.
"It's reckless against these two women. They, too, are supporters of WikiLeaks."
Assange has denied the allegations of sexual misconduct, which his lawyers say stem from a dispute over "consensual but unprotected sex."
He has not been charged.
The lawyer said Assange had every right to reject the women's sex claims, but added Assange was, in essence, accusing them of breaking the law by suggesting they were driven by ulterior motives.
"There is no truth to this whatsoever," he said.
British newspaper The Times recently quoted Assange as saying there was "very suggestive evidence" the two women were motivated by revenge, money and police pressure.
When the investigation began after the August incidents, Assange said he had been warned about "dirty tricks" from the Pentagon.
At the time, WikiLeaks had deeply angered US officials by publishing tens of thousands of secret US military documents on the wars in Iraq and Afghanistan, memos that the US said could have put the lives of informants at risk.
The Aussie met both women in connection with a lecture on August 14 in Stockholm.
One, a 31-year-old, was involved in organising the event for Sweden's left-wing Social Democratic Party and offered to host Assange at her apartment. The other, a few years younger, was in the audience.
Assange allegedly had sex with both women within a week, police documents show.
The women realised that had happened when the younger woman contacted the older one seeking to get in touch with Assange. They went to police together, not to file criminal complaint, but to seek advice, Borgstrom said.
A policewoman decided there was reason to suspect they were victims of sex crimes and handed the case to a prosecutor.
On January 11, 2011, the British court will balance Assange's claim
that is all a CIA "dirty trick" against the claim that Assange committed a dirty
trick of after having consensual PROTECTED SEX, then had UNPROTECTED sex with a
sleeping woman, not just one woman but at least two.
Then, Assange's own evidence will come up, he bragged that he was an 87% slut, wanted to create children and criminal conspiracies. His forcible unwanted unprotected sex, exposed the ladies to at least the high risk of catching some nasty STD's and possibly HIV. It's that kind of revolting evidence that will result in Assange having one first class seat with a pair of handcuffs.