A MAN who allegedly expected to have sex with a 13-year-old brought a consent form for her to sign, police say.

Adam Robert Dimond, 31, is accused of trying to groom the girl - who was actually an undercover FBI agent.

He later admitted that he believed he was texting a child and "thought about engaging in sexual acts with her", according to cops in Utah, USA, the Standard Examiner reported.

A police report seen by Desert News said: "In his car was a document that he made that was a consent to have sex form."

And according to search warrants, investigators analysed Dimond's mobile phone for possible "other crimes involving children".

Dimond allegedly believed he was chatting to the child - who was actually an FBI agent sending "sexual" messages - on the anonymous messaging app Whisper.

He was arrested at an address in Farmington, Utah, and he allegedly handed over the apparent "consent form".

The legal age for consent in Utah is 16 - which would render any consensual sex contract useless.

He has been charged with one count of enticing a minor by internet or text.

Dimond posted an £8,000 bail and was released from Davis County Jail on Friday.

His next court date has not been set.

Police also arrested a second man as part of the same undercover operation.

Angus Logan, 21, is also accused of enticing a minor by internet or text.

He too had messaged the same agent allegedly believing them to be a 13-year-old girl on Whisper, police say.

Investigators claim he brought a condom to an address where he thought he was meeting the child for sex - but cops were waiting for him.

He has been held in Davis County Jail ahead of his next court date.