Our enablers over at Curbed have word that Osento -- the city's only hot tub and "sauna refuge" for (biological) females -- will close its doors for good. What goes on inside the sugar walls of Osento, located on Valencia Street? We can only imagine; clucking about boys, stickers, My Little Pony dolls, and who they want to marry, we assume. Another blow for San Francisco business and women's dirty parts. Alas.