Langwarrin couple Craig Stanley, 28, and Rebecca Michels, 25, face charges relating to possessing child pornography, producing child porn and performing an indecent act with a child.

Court documents from Michels' bail hearing revealed the couple appeared in dozens of photos posing semi-naked and naked with a 10-year-old girl.

The parents of the 10-year-old - who cannot be identified for legal reasons - also appear in the photos. Both couples are believed to have attended Solar West naturist club's fortnightly swimming nights at Maribyrnong Aquatic Centre. A club spokesman, who declined to be named, confirmed Stanley had been a member of the club "years previously" and attended a swim night once in May this year.

One of the parents was also believed to have attended that night session. It was not known whether the child was also present.

After the allegations emerged, the council met with the club, the spokesman said.

Earlier this month, the council informed the club its night sessions were "suspended indefinitely" until the court case had been resolved, a club spokesman said.

Solar West naturist club had been running regular nudist swim nights every second Saturday at the Maribyrnong Aquatic Centre for over 20 years "without incident", he said.

The spokesman said the club had no knowledge or involvement, and police had not contacted them.

He said Solar West had been unfairly implicated. "Like any social or sports club, we are not responsible for our members. What they do in their own time is nothing to do with us," the spokesman said.

He maintained "nothing untoward or suspicious" took place in May. "There is nothing sexual about [the naturist] lifestyle," he added.

It is not known whether the two couples met at the swim night or previously knew each other.

Court documents revealed the parents had "made admissions" relating to taking photographs with their daughter.

Michels and Stanley were arrested in Dimboola in November. They had gone missing after being linked to an FBI child porn investigation.

Police found the photos of the girl along with 40,000 images alleged to be child pornography when they seized computers and cameras in October.

The parents of the child are yet to be formally charged but were expected to be charged on summons.