The New South Wales Christian Democrat MP Fred Nile says neither he or his staff have been "perving" at internet pornography videos on their work computers - but they have been researching the issue.

A parliamentary audit of MPs' internet use has already claimed one scalp with the ports minister Paul McLeay resigning from cabinet yesterday.

He admitted using his work computer to access gambling and adult websites.

There are reports the audit also found Fred Nile's computer had been used to access internet porn.

Mr Nile says, for research purposes, a senior researcher viewed the websites of organisations like the Australian Sex Party and the Eros Foundation, and then followed links from the sites.

"I suppose it may confuse some people but they can be quite confident in my own integrity," Mr Nile said.

"I have not viewed this material, neither have I had my staff sitting there perving over a pornographic film - but investigating this very important social issue area."

The Christian Democrat says a staff member did view a few seconds of inappropriate material - but only so he could determine the nature of it.

He says he does not have a computer in his office and a part-time researcher uses his log-in.

"I've just had a report from the clerk of the parliament showing that there has been nothing viewed on [my log-in] dealing with anything related to pornography," he said.

"In fact the only items that are showing are something called 'pop-ups'."

Mr Nile says he is happy for his three office computers to be confiscated and investigated.

Parliament's Upper House president, Amanda Fazio, is warning against reading too much into the internet audit.

"A recorded hit includes access to a legitimate site such as a newspaper site, which may contain links to other sites that may be categorised as adult content," she said.

"We know from our own information technology sections in the parliament that that is simply the case. Therefore it's not possible to identify any breaches of parliament's internet and email usage policy."

A statement issued by the Speaker and President of both chambers says a small number of other parliamentary internet users may require further investigation.

The statement says at this stage there is no information to suggest the users have breached guidelines.

Yesterday an emotional Mr McLeay went to Premier Kristina Keneally after information about his computer usage became public.

"It wasn't a one-off. It was a mistake and I accept that the community expects a higher standard and that's why I offered my resignation," he said.

"I know the community expects more of its ministers and our MPs, and that's why I am personally humiliated and embarrassed.

"But I accept that it's wrong and that's why I've offered my resignation as the minister."

The former ports and waterways minister would not go into detail about which sites he had accessed, other than to say "there was nothing illegal about anything that I have viewed".