An Adelaide man was both “sinister and predatory” when he created two fake Facebook accounts to groom teenage girls for sex, a court has heard.

Jay Williams posed first as a girl or woman and then as a freelance photographer when he contacted three girls over the social media platform in 2017 and 2018.

With one 13-year-old girl he went as far as drawing up fake contracts and took them to her to sign to allow him to take photographs.

He also made calls to another girl which were of a sexual nature and sent sexually graphic messages and images to a third.

Sentencing Williams on Tuesday, District Court Judge Paul Muscat said it was disturbing the steps the 30-year-old had taken with his offending.

“There is something very sinister and predatory about your behaviour which, from what I have read in the psychological report, you appear unwilling to acknowledge,” the judge said.

“It is very clear to me what you were setting out to do.

“What you did in creating and assuming false identities to commit these offences is extremely concerning.”

Williams pleaded guilty to two counts of making communication with the intention of making a child amenable to sexual activity.

He is already in jail for other offences including car theft and assault and must now serve a total head sentence of just under three years with a non-parole-period of 18 months.