Hot and bothered by rising pump prices? Australian brothels are offering clients discounts based on their gas bills.

Brothel owners claim the system works much the same way as supermarkets which offer shoppers discounted gas prices by presenting their grocery bills when they fill up their tanks.

"If you come in and spend time with one of our lovely ladies, we'll give you a discount of 20 cents a liter," Kerry, manager of Sydney brothel The Site, said on Wednesday.

There is no link between brothels, petrol providers or supermarkets but brothels say the system is simple.

Once you've filled up your car, bring your receipt to the brothel and they'll discount the price of your visit.

The bill for a full 50-liter tank at 126.9 cents per liter comes to A$63.45 ($48.22). With the offered 20c a liter discount, the petrol bill would have instead come to A$53.45.

That A$10 difference is taken off the A$150 cost of a 30-minute session with one of the brothel's "service providers."

The Site has taken out cut-out newspaper ads offering the service.

"We're getting more media exposure, if you want to put it that way, than basically bums³ on beds," Kerry said.

Brothels are legal across most of Australia, but states have strict laws against soliciting⁴ and running brothels in residential⁵ areas, and near churches or schools.