As you can see by the picture linked the brothel has been designed to look like a Edo period castle.
Like onsens and other Japanese bathing places, it is customary to wash before entering the tub.
Some of these lubricants are supposedly good for the skin.
Linen, lubricant, drinks, condoms, and cigarettes are primarily the burden of the soap girls.
Upon inspection, they are usually hidden in the roof and at times where there are unannounced inspections; they are quickly torn up with a knife and hidden in places like the storage room or bathtubs.
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To skirt these laws the operators changed their ways and continued operating their existing brothels as bath houses which still exist to this day.
This will be the basic Soapland routine that will be repeated 2 to 3 times until your stamina or time runs out.