MT,
No, I know nothing about Las Tequilas, but I've never heard the name associated with prostitution.
Most action of the play-for-pay variety is located in areas closer to the heart of downtown San Jose. There's the Gringo Gulch area (roughly south of Morazan Park, north of Avenida Central, east of Calle Central and west of about calle 15. There's the cluster of massage parlors on Paseo Colon about 14 blocks west of the Gulch; P. Colon becomes av. 2 downtown. There are the "zonas rojas" (Red Zones, mostly filled with low-priced '"tico" massage parlors and bars (i.e. mostly local guys go there), which can be dangerous for a newcomer or if you insist on walking around either drunk or alone at night.
It would help me to know when you're coming into town and for how long you'll be staying. If you're coming in for work, presumably you'll be busy during the daylight hours which might limit your opportunities.
One thing I strongly suggest is to come to the Sportsmen's Lodge either during weekend football hours or around 5:00 p.m. most days. You'll meet other CRT'ers who can help you find true love or a reasonable facsimile thereof.

You might even be able to talk one or more guys into winging with you to one of the clubs, or an option I forgot, Bar Idem.
Bar Idem is a combination massage parlor and bar. It's expensive at between $62.00 and $72.00, depending upon which class of room you choose (the downstairs rooms with private bath are more expensive). Drinks are pricey too.
If you have time before your trip, do a little more reading here. use the Search function etc. If you still have questions, don't hesitate to post them here or PM me. If I don't know the answer, chances are I know someone who does.
I wish you the best on your first trip to Costa Rica.