Right-to-die activists have called on WA politicians to "stand up and be counted", saying it is no longer good enough to hide behind a conscience vote on the issue.
Five months from a State election, the WA Voluntary Euthanasia Society has written to MPs asking them to go public with their views, hoping to make it an election issue.
The last time WA politicians voted on euthanasia in 2010 it was defeated in the Upper House 24-11.
Greens MP Robin Chapple, who introduced that Bill, has left the door open to reintroducing similar laws if there is sufficient support.
WA Voluntary Euthanasia Society president Murray Hindle said past votes did not reflect wide popular support for euthanasia.
He said the society had tried for 30 years to get politicians to stand up for the issue but they always hid in fear of powerful minorities or behind a conscience vote rather than what the community might want.
"It's a human rights issue. People should have the right to have their life terminated under certain conditions," he said.
Perth woman Barbara Harrison, 64, has multiple sclerosis and is appealing for legal euthanasia as she plans to take her own life.
Exit International's Perth leader Carol O'Neil, a nurse of 35 years, said Ms Harrison had exhausted "every possible thing" doctors suggested to make life bearable.
Right to Life Association WA president Peter O'Meara said Ms Harrison's case was sad but euthanasia was not the answer and affected the moral values within society.
Premier Colin Barnett said he did not support euthanasia and the Opposition had no plans to introduce euthanasia laws.