As I enter the spa, I place my shoes in a cubby. At the reception desk I am issued a Lucite bar and a wristlet with a digital code. I'll use this for any purchases or treatments, including massages, food, and drink. It is also my locker number. This cashless system makes it easy to spend money -- one pays on the way out.
As I enter the dressing rooms I have a choice of three types of stylish spa-issued jammies and get a net bag with towels. (At a traditional onsen , guests receive a cotton kimono called a "yukatta.") I wave my wrist in front of the locker scanner and it opens. Then all I have to do is leave my clothes and inhibitions behind.
The locker rooms and bath areas are segregated by sex. Bathing in an onsen or public bath is a communal affair. Although everyone is naked it is very modest. All I am wearing now is my wristband. I bring that rectangular piece of white cloth they call a towel with me as I take to the waters.
Knowing the proper etiquette for bathing in Japan will put you and your fellow bathers at ease. I overheard one group of foreign guests say they had brought their bathing suits because they didn't know what to expect. You will be more conspicuous if you are wearing your bathing suit instead of your birthday suit. Their suits were left in the lockers.
That little towel is important. First, you can drape it modestly in front of you. Second, it is used for washing, which is what patrons do before they go near the deliciously warm pools of water. I walk through the doors into a huge area of knee-high three-walled cubicles. Each has a spigot, bucket, soap, shampoo, and conditioner. I scrub and rinse until clean. In the women's area there is usually lots of chatter. After washing I have several choices. The indoor shallow saltwater pool is pleasantly hot and usually the first stop. Women are submerged to their shoulders. The white towels are now folded in neat little squares and top their heads or wrap their hair.