1 October 2013 Image source, Getty Images The only Finnish word to make it into everyday English is "sauna". But what it is, and how much it means to Finns, is often misunderstood - and it's definitely not about flirtation or sex. In a dimly lit wood-panelled room, naked men sit in silence, sweating. One beats himself repeatedly with birch branches. Another stands, takes a ladle of water and carefully pours it over the heated stones of the stove in the corner. There is a hissing noise.