British broadcaster Channel 4 removed all seasons of the show from its streaming service in May after two women told BBC News they were raped during filming, while a third had described an allegation of a non-consensual sex act.
They all said the show did not do enough to protect them, the BBC reported.
The show, where strangers are matched by experts and "marry" in front of the cameras, is part of an international franchise across multiple countries, including the United States and Australia.
Channel 4 has said it was presented with "serious allegations" of wrongdoing against a small number of past contributors in April, allegations "we understand those contributors have denied".
It has launched a review into the hit reality TV show, which is made by independent production company CPL.
London's Metropolitan Police told the BBC in a statement: "On Thursday, 18 June, Met officers arrested a man in his 30s on suspicion of rape.
"This relates to an ongoing investigation, being led by the Met Police."
Channel 4 has not made a decision on whether to broadcast the latest season of the show, which has already been filmed.
with PA
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1800 RESPECT (1800 737 732)
National Sexual Abuse and Redress Support Service 1800 211 028
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