The analysis comes from data scientists who are analysing the leaked material, and from developer Luke Metcalfe, who works at online property search engine NationMaster. Fairfax Media's map draws on the locations that users entered when signing up to Ashley Madison. There are incentives to insert an address close to where you live or work as Ashley Madison goes to some lengths to pair users with other adulterers in their local area. However, according to the data, central postcodes including Sydney 2000 and Melbourne 3000 have clocked up more members than there are actual residents in these areas according to 2011 Census data – suggesting more than a few users are reluctant to disclose too much identifying information, other than which city they live in. Analysis by the Washington Post also shows many Ashley Madison members across the globe likely lied about their dates of birth.

One in 12 entered their birthday as New Years' Day, and a disproportionately high number picked (sadly, if they were looking to cheat) Valentine's Day. Many also entered doubled-up months and days (e.g. 2/2, 12/12). This explains why, when exploring the interactive map below, you'll see some suburbs showing more than 100 per cent of their populations are Ashley Madison members. Mr Metcalfe's maps (see below) draw on the postcodes associated with the millions of credit card transactions from around the world made on the Ashley Madison site, the details of which were also included in the leak. This may be a more accurate indication of where cheaters are located, as these are paid-up subscribers to the site, as opposed to casual visitors perhaps just looking to satisfy their curiosity.

However it's unclear whether the postcodes mapped here are linked to the place where the card is registered or to where the transaction took place. Mr Metcalfe says he will be updating his property search engine to include the Ashley Madison data, possibly as part of the "suburb happiness" measure featured on the site. Melbourne, Ashley Madison credit card transactions by postcode Ashley Madison users in Melbourne. Victorian locations, number of accounts with credit card transactions registered