Australian customs officers have been given new powers to search incoming travellers' laptops and mobile phones for pornography, a spokeswoman for the Australian sex industry says.

Fiona Patten, president of the Australian Sex Party, is demanding an inquiry into why a new question appears on Incoming Passenger Cards asking people if they are carrying "pornography".

Patten said officials now had an unfettered right to examine travellers' electronic devices, marking the beginning of a new era of official investigation into people's private lives. She questioned whether it was appropriate to search people for legal R18+ and X18+ material.

“Is it fair that customs officers rummage through someone's luggage and pull out a legal men's magazine or a lesbian journal in front of their children or their mother-in-law?” she said.

"If you and your partner have filmed or photographed yourselves making love in an exotic destination or even taking a bath, you will have to answer 'Yes' to the question or you will be breaking the law."