When we were living on the peniche "Black Moon" on the Seine the peniche moored next to us was "Cornelia" and Guy and Ruth would have us over for Sunday dinner and a sauna...
Yes a sauna!
The sauna on "Cornelia" did double duty as the central heating system and made a whole lot of sense as Paris is not unknown for its chilly winters. More than once doing the "jump off the snow covered deck after sauna plunge" into the Seine, I was reminded just how cold Paris and environs can be... Or even the south of France on occasion as this picture of the peniche "Emma" shows...
Of course, the sauna on "Cornelia" was big enough to have a bunch of people and impossible to place within a sailboat of anything less than mega-yachtish proportions, but I have always had the wish of a small sauna that would fit into a cruising sailboat... Which is why I found these barrel saunas so interesting. You could almost fit them inside a sailboat!
Of course, I don't need a sauna on the boat but I sure as hell would like one and given that there is some high/low latitude cruising foreseen in the hopefully not too distant future... Just maybe I can massage it into the need vs want list...Chilean Fjords and a sauna do paint a nice picture...