David Carrick, 46, is due to appear virtually in court on Monday
David Carrick, 46, was arrested on Saturday in Hertfordshire and suspended from the force.
He is due to appear virtually at Hatfield Remand Court on Monday.
A referral has been made to the Independent Office for Police Conduct, Metropolitan Police say.
Mr Carrick was based within the London police force’s Parliamentary and Diplomatic Protection Command.
He was not on duty when he was arrested by Hertfordshire Constabulary, according to the Met.
In a statement, commissioner Cressida Dick said that she recognises that the public will be concerned by the arrest.
“I am deeply concerned to hear the news today that an officer from the Met’s Parliamentary and Diplomatic Protection Command has been arrested and now charged with this serious offence. I fully recognise the public will be very concerned too,” she said.
“Criminal proceedings must now take their course so I am unable to comment any further at this stage.”