According to Sky News, Christian B has insisted on having sex in his camper van with a young woman who will back up his alibi.
He claimed he was driving the women to the airport in Faro, Portugal, for a flight home the next day, when they were stopped and photographed by police.
The woman was arrested at airport security and later appeared in court, according to the suspect.
Christian B believes that Portuguese police need a record of the events that will establish his relationship with the young German woman who was on vacation in Portugal with her parents.
If true, his alibi would contradict crucial but circumstantial evidence from mobile phone data masts, which police claim places him near the apartment where three-year-old Madeleine vanished from her bed 15 years ago on May 3, 2007 in Praia da Luz.
The 44-year-old German man is currently serving a seven-year prison sentence for rape.
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