PC David Carrick, 46, was charged last month with the rape of a woman in a hotel room after they had met on a Tinder date.
On Wednesday, the Crown Prosecution Service revealed Carrick is now facing a further 13 charges involving a catalogue of alleged sexual assaults of three other women.
He appeared via videolink from HMP Belmarsh on Friday afternoon to face the new charges for the first time.
Carrick, who was part of the Met’s Parliamentary and Diplomatic Protection Command, is accused of coercive and controlling behaviour and the false imprisonment of a woman he is accused of subjecting to two rapes and a series of sexual assaults.
The police officer faces two charges of sexual assault and an alleged attempted sexual assault of a second woman.
Carrick is accused of rape, sexual assault and coercive and controlling behaviour towards a third woman, and raping a fourth woman in a hotel room.
Chief Magistrate Paul Goldspring remanded Carrick back into custody until a plea and trial preparation hearing at St Albans crown court which has been set for December 3.
The police officer, wearing a pink Franklin and Marshall T-shirt, puffed his cheeks out as the court hearing ended.
He spoke only briefly, to confirm his name and date of birth, and has not yet formally entered any pleas.
Carrick is now charged with four charges of rape, three counts of sexual assault, two allegations of sexual assault by penetration, two counts of coercive and controlling behaviour, a charge of false imprisonment, a charge of attempted sexual assault by penetration, and causing a person to engage in sexual activity without consent.
Announcing the charges, Peter Burt, Senior District Crown Prosecutor for CPS Thames and Chiltern, said: “Following a referral of evidence by Hertfordshire Constabulary, the CPS has now charged David Carrick with a total of 14 alleged offences against four women.
“We remind all concerned that criminal proceedings against the defendant are active and that he has a right to a fair trial. It is extremely important that there should be no reporting, commentary or sharing of information online which could in any way prejudice these proceedings.”