from the subtle innuendos in their brochure and web site I am sure even the local authorities have worked out it is a sex on premises venue where people go to have sex with other customers - though they do have a few masseurs available if all else fails
as with most other saunas (and fast food eateries) "the photos are for promotional purposes only" and may not reflect for example the actually number of hunks that will be lounging around in the pool on the day you visit
as with many other Thai saunas total darkness and minimal "relaxing room" furniture is the design motif so eat your carrots before visiting and perhaps bring your own rubber mat
if you have already visited Chiang Mai many times you may already have the requisite skills to negotiate a journey to the venue - it is not exactly a prime location
on my last two visits there were few/no customers worth the effort but your mileage may vary, or BYOF may be a good option
unprotected access protocols like HTTP are discouraged - always play safe and use HTTPS!
bkkguy