Only if she’s Dutch or Portuguese, should he say: “You have beautiful ears.” Researchers measured the success rate of each line by seeing if they prompted any response at all and their success at instigating a longer conversation.

[Read: 12 sexy ways to make him go down on you without a push] #29 Are you feeling a little down? #30 You remind me of my pinky toe because I’m going to bang you on every piece of furniture imaginable.

[Read: Why the 69 position isn’t all it’s cracked up to be] #32 Do you think it’s loud in here?

If she is Italian, French, American or Brazilian, a man should tell her: “You dress beautifully.” If she is Spanish or South American, a man should praise her hair.

If she’s German or Canadian, he should praise her skin.

How will the story stack up against the greatest films about business?

There seems to be quite a common stereotype out there that men are the only ones who ever use pick-up lines to attract the opposite sex. But do you know what would make your face look better? [Read: 18 girl on top tips to make sex a lot sexier! The least used line was “You have beautiful ears”, which was also the second least effective line …except in the Netherlands and Portugal, where it proved the most popular.Lloyd Price, the dating site’s marketing director, said: “We have found the Holy Grail of flirting.” What are your favourites?The Big Short, the film adaptation of Michael Lewis' book of the same name about the causes of the financial crisis, opens in UK cinemas this weekend. #25 Screw me if I’m wrong, but haven’t we met before?