You do the same thing every time where you just claim to talk to important people in the legal system in Tijuana who supposedly assure you that prostitution is legal. All just conjecture until you can demonstrate otherwise. Show me in the penal code where there is an exception to prostitution. In fact, post the actual code and tell me which part of that code allows prostitution.
And talking to someone who is the equivalent of a US district attorney would be rather foolish to get clarification on state law, since a US attorney is a federal attorney and the penal code I cite is the state law, not the federal law. You are correct, prostitution is not illegal per federal law. It is also not illegal per city ordinance that I know of. It is illegal per state law.
Bars with curtains on the doors are public places. It is actually a special type of public place which is referred to as "private property with public access", in this case it being restricted public access where minors are not permitted. This means you would not be guilty of trespassing by entering as you would if you jumped the fence into someone else's front lawn without being invited.
Your argument about public prostitution vs private prostitution is quite ridiculous as well. "It's legal if the police don't find out about it." Well doesn't that go for any law? Until you post some actual substance, I'm afraid all we'll get is hearsay and conjecture from you. I've posted the penal code several times and it speaks for itself. You going on and on about "But this guy told me, I swear! He's an attorney!" is worthless.