Gerard Bernadotte, the so called ‘fake’ Prince, is being sued by Lufthansa airlines for allegedly pretending to be in a gay relationship with flight attendants in order to qualify for reduced airfares.

He was adopted aged 34 by the Swedish King’s second cousin Jan Bernadotte and is reported to have a frosty relationship with his royal “relatives.”

The 50-year-old, who is being sued for more than £79,000, appeared in Hamburg court on Tuesday and denied charges of fraud.

He claimed that he had sex with his flight crew boyfriend “from behind and the front.”

TheLocal.se reports that Bernadotte claims that there are several witness who can prove that they are a couple and that they even had a “dirty weekend” in Bangkok last Christmas.

Jan Bernadotte, who is only 13 years older than his adopted son, admitted in 2006 to newspaper Aftonbladet that he had agreed to the adoption in exchange for £141,000.

He says that he did it because of financial difficulties at that time.

“I think the Royal Family’s a bit cross with me,” he told Expressen in 2004.

“He certainly shouldn’t go around calling himself a Swedish prince. I’m sorry I ever adopted him.”

This is not the first time Benadotte has been in trouble with the law. In the mid-1990s, he was jailed four and a half years in Germany for bank fraud.

The trial will resume in August.