I am Bangladeshi but have been out of the country for 11 years in Australia.
After coming back I realized how quickly Dhaka has changed in every aspects, and also how the underground sex industry has risen.
Picking up from star hotels like Westin/Radisson/Ruposhi Bangla (formerly Sheraton)/Sonargaon and Sarina is probably the safest option for you if you are living in or around the hotel area. Only downside is the girls are way too Xpensive in Bangladesh\\\\\\\'s context. The reason they have inflated their service charge is because they have found that the foreigners are easy target for them as tourist/expats usually don\\\\\\\'t know the right bargaining technique and as a result these girls are getting greedier and greedier.
The other night when I went to Westin Bar, I started chatting with this girl and when I asked her how much would be the damage she said 20,000 Taka ($250 at today;s exchange rate) for the full night. I know $250 for a night may not seem high in western standard, but when you consider that Westin\\\\\\\'s manager gets paid $400 a month....$250 is a LOT of money for one night (unless she is a top model in BD).
I have discovered this place in Bashudhara R/A, which has a collection of about 4-5 girls at any given time. The girls are descent with some basic/minimal English skills and the charge is 2500 Taka per shot but alternatively I negotiated 3,000 taka with the pimp and the girl and went by the hour (Cost-Pleasure Rating: 6.5-7.0)
In regards to the place near LabAid, it is currently laying low and will resume operation soon (they do it every few months). - Will update
As for my fellow mongers, let me know if you wanna team up for any other activities like drinking or choofing? I have lost my network of buddies who were once actively involved with partying and living loud, but now they are mostly dedicated family men with a full time job. Their definition of fun and socializing is limited to watching movies and eating at restaurants (which is fine with me but for me there needs to be something more). Would be happy to meet people with similar interest.