Love Actually has been named the nation's most romantic movie in a new study into viewers' emotional reactions.
Online movie rental firm LoveFilm examined the neurological responses of couples to what they saw on screen, with the Richard Curtis-directed tale giving the strongest reaction.
Neuropsychologist Dr David Lewis, of Mindlab International, who analysed the reactions, said: "When a couple watch a romance together each person mistakenly attributes a part of the adrenaline buzz produced by the film to the presence of their partner.
"Couples are far more likely to touch, hold, hug and kiss one another than couples watching a less emotional film."
LoveFilm editor Helen Cowley said: "Our research shows that romantic movies can cause a romantic reaction, which is why snuggling up with a carefully chosen film is the perfect way to spend time together this Valentine's Day."