Dominique Strauss-Kahn claims he never knew he was having sex with prostitutes.

The greatest excuse in the history of all time was heard in a courtroom when the lawyer of Dominique Strauss-Kahn claimed Kahn never knew he was having sex with prostitutes at organised sex parties because “all of the women were naked at the time.” Oh DSK, you’re so funny.

The Daily Mail reports that the strange excuse came as new mobile phone records showed Kahn had slept with 10 different prostitutes who all charged upwards of €1,600 at a time.

As these sordid facts were revealed, Kahn’s lawyer Henri Leclerc said: “There is no way he could have known these women were prostitutes.” Um…yeah…sure he didn’t…

Dominique Strauss-Kahn has already confessed to attending crazy sex parties and having a “liberated but legal” sex life. He’s also jumped on the ‘help-I’m-a-sex-addict’ bandwagon and says that he needs treatment for sex addiction. But he claims that he never knew girls were being paid to have sex with him and said he had a “horror of prostitutes and pimps.”

It’s okay though folks, because his lawyer has an ingenious argument: “At these parties, people were not dressed, and I defy you to tell the difference between a naked prostitute and any other naked woman.”

How to tell the difference between a naked woman and a naked prostitute – surely it’s one of life’s more complex dilemmas.

But wait, it gets better!

Strauss-Kahn has branded claims that he slept with call girls as a “malicious insinuation” and has vowed to clear his name.

The former IMF director has been caught up in a tidal wave of sex scandals ever since he was arrested for allegedly trying to rape a maid at a New York hotel in May last year. The charges were dropped but shortly afterwards there were new accusations that Kahn had sexually abused a young French writer – these charges were dropped as well.

After being named in connection with an underage prostitution racket in northern France, Kahn confessed that he had taken part in sex parties. It has never been suggested that he slept with underage prostitutes – prostitution is legal in France as long as the girls are over 18 – but he could face charges for procuring girls.

Police are set to interview Strauss-Kahn in the coming weeks over his links to the prostitution racket.

In the meantime, we wonder if we can apply his hilarious excuse to other areas of our lives: "Okay, I drank the alcohol but I didn't know it was alcohol because I swiftly removed all of its labels and put it in a mug before I drank it..." Fool-proof.