You must buy a ticket at the counter 1st. Usually they have early bird discount, 1st 3 person there for the day gets 20% off entrance + free condom. Yes, besides paying the girl tips for her massage and special, it is also a requirement to pay her $2 per piece of towel used. So if you do not wanna waste money on towels, you can bring your own.
Lastly, mention you are a member of SBF and get free lucky ang pow on your way out