The match-making website Secondwife.com, which helps Muslim men and women find a second spouse, has thousands of members worldwide accoridng to it's founder.

Azad Chaiwala told Fairfax that Australia accounts for around 750 of those members.

Polygamy, which is the custom of having more than one husband or wife, is illegal in Australia.

Chaiwala said fading "stigmas" and "social taboos" are leading to the site's rise in popularity in Australia.

"A lot of Muslims give their cultural background precedence instead of looking at what religion says," he said.

"There is a lot of stigma now against Muslims so they're being stupidly cautious."

The website's front page includes definitions of polygamy, testimonials and a line from the Quran, which reads: “Then marry women of your choice, two or three, or four but if you fear that you shall not be able to deal justly, then only one.”

One of the testimonials said: "The site is really easy to use and mobile friendly. A site that cares about the lifestyle of polygamy and really takes the effort to guide people properly."

Executive director of the Australian Muslim Women's Centre for Human Rights, Joumanah El Matrah, told Fairfax that polygamy was an underground practice in Australia.

"It's frowned upon because Muslims are of the view that you can't treat two women equally," she said.

"Women and children fare very badly in polygamous set-ups. There tends to be a lot of suffering and loneliness. The limited evidence we have is that there is an increased risk of domestic violence."