An increasing number of Australian couples are choosing not to have children, and they don't have any regrets about the decision.

Brisbane woman Tanya Williams, 47, and partner Shayne, 50, are one of them.

The couple has chosen not to have children, and are fighting back against rude questioning of their choice, and the stigma associated with their choice.

The book is out now. (Supplied)

Tanya has written a book called A Childfree Happily Ever After: Why More Women Are Choosing Not to Have Children.

"Society tells us we can't be child free and live happily ever after, but I don't believe that," she tells 9Honey.

"I'm not anti-kids and I'm not anti-mums, I just want women to be able to make the right choice for them.

"Make your own rules, and stop judging others."

Tanya says she was honest and open with her husband about her decision not to have children. (Supplied)

Tanya says when people find out she doesn't have children the assumption is she couldn't have them.

"There's a lot of criticism and a lot of judgement and they think they know better than you, and you will never be happy," she says.

"Some of the comments can be quite hurtful."

She says there are the inevitable questions asking if they may one day regret not having kids, or if they feel they are missing out.

Tanya says she wrote the book to change the conversations from one of judgement, to support.

"One of my best friends has four children, and I love her kids," she says. "We joke about how different our lives are, but we fully support each other."

She says society needs to stop identifying women as being mums.

"What else are you? You're more than that."

Tanya and Shane have been married for 24 years.

'Some of the comments can be quite hurtful.' (Supplied)

She says she was open with him early on about not wanting to have children, and he was has been supportive of her choice.

"I've check in with him over the years, and he is happy with his nieces and nephews," she says.

Tanya says more couples should have honest conversations about children before committing to each other.

"I always knew having children wasn't for me," she says. "I never wanted that life. I just knew innately that I was never going to have children.

The couple are happy with their nieces and nephews and fur babies. (Supplied)

Her choice not to have children aside, Tanya is a high-achiever, driven and motivated. She enjoys work, and travel.

"It's very much a lifestyle choice," she says.

"There's judgement around everything women do," Tanya continues. "But not everyone wants to have a partner or have kids."

The couple do have their 'fur babies' and Tanya runs her own business as a Digital Strategic Consultant.

While Tanya is keen to defend supporting women, regardless of their lifestyle choices, she feels there is much work to do when it comes to not only how society views these women, but how workplaces treat women and men who don't have kids.

"Over the years I've felt discriminated against because I don't have kids," she says. "I had a situation where I needed time off because one of my dogs was sick.

"I was told, 'Oh, it's just a dog.'"

"If it was a child, I would have definitely been given the day off. How is that fair? You wouldn't expect a parent to work if she had a sick child."

Tanya also says during her time in the corporate world, she was often expected to pick up a lot of the slack while parents left to pick up their kids from childcare.

"If you choose to have kids, you get maternity leave and paternity leave. If you choose not to have children, you should also be given equitable time, to travel or write a book.

"Having children is a choice that is rewarded. The choice not to have kids is not rewarded.

"It's not equitable or fair."

Tanya wants more workplaces to have conversations like these, suggesting 'pup-ternity leave' for pet honours.

"It's the next logical step," she says.

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