THE state's Dignity for Disability MP wants taxpayers to fund sex workers for people with disabilities.

Today, Kelly Vincent will weigh into the debate on decriminalising sex work by calling for a more "permissive" culture around using disability services funding to pay for access to a sex worker or sex therapy.

Ms Vincent conceded there would need to be eligibility criteria and limits to government-funded access to sex workers but this could be facilitated through the Government's new self-managed funding system. However, this would be reliant on the passing in Parliament of a Bill decriminalising sex work.

Ms Vincent said her proposal would not "necessarily mean" extra government funding, but a change in policy "so that money which might already be allocated for physical therapies or mental health services could be legitimately spent on sex services".

"We need to create a culture within disability service provision that is accepting that many people ... with a disability are sexually active or have sexual desires," she said.

Ms Vincent said research showed there were proven benefits of sex therapy, and cited programs in Scandinavian countries which allowed access to government-funded sex therapy.

Her call comes as NSW sex worker Rachel Wotton visits Adelaide to brief MPs before a screening of the documentary Scarlet Road tonight, which features her work with clients with a disability.

Labor MP Steph Key had a private member's Bill before Parliament to decriminalise sex work before it was prorogued at the end of last year.

She is now redrafting the Bill and plans to reintroduce it in about a month. In drafting her Bill, Ms Key said she had come across people with disabilities already covertly hiring sex workers and she supported Ms Vincent's proposal.

Adelaide sex worker and vice-president of the Scarlet Alliance Ari Reid supported the proposal, adding sex workers could help people with intellectual disabilities to learn about safe sex and appropriate sexual behaviour.

"It's often a long time since someone (with a disability) has been touched in a sensual way," she said. "I'd really like to see a time when we can speak about it openly."