Some 21 percent have said that they are secretly planning a reunion with their first lover - and men are most likely to carry a torch for an old flame, with 24 percent admitting they still lust after an ex.

But it isn’t just men. Supermodel Kate Moss, who began a four-year relationship with actor Johnny Depp when she was 21, said, years after their romance was over (but before she met husband Jamie Hince): “I just haven’t found anyone I want to spend long periods with. I don’t think I’ve completely got over my relationship with Johnny Depp.”