The Japanese adult entertainment industry is strictly regulated and highly sensitive to disruptions. To ensure a smooth experience and avoid being blacklisted, you must adhere to these foundational rules:
Many fuzoku establishments enforce a strict "Japanese Only" rule. This is rarely rooted in xenophobia, but rather in risk management. Shops need to ensure that customers fully understand the rules, pricing, and boundaries of consent.
If you do not speak conversational Japanese, you must look for shops that explicitly advertise themselves as foreigner-friendly. Using a translation app on your phone is usually not accepted as a substitute for speaking the language at the front desk.
Japan does not have a tipping culture, and this extends to the fuzoku industry. The price you are quoted at the front desk or on the website is the final price.
Do not attempt to negotiate prices, and do not offer cash directly to the attendant in exchange for extra services. Doing so is highly disrespectful and places the attendant in a dangerous legal position. Pay the agreed-upon price at the reception or to the driver.