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What you really want is to come up on the radar of the Mexican police. They will be happy to see a jew gringo taking pictures of the local sluts. Be prepared to get your camera confiscated (it will be) and your teeth kicked in by the local hombres, all before you can say, "american consulate! i am an american citizen!" If you are lucky they won't piss and shit on you and leave you in some alley way (after the requisite beating, camera confiscation, etc).

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BC hit the nail on the head. If you are caught taking pictures of locals in EL Norte (north TJ where the brothels are) by the locals, you will get beat bloody if not dead.
If you are caught taking pictures of the locals by the policia, it will cost you every dime you have to keep out of jail.
The girls, most likely, will not let you take their pictures because they don't want family to know what they do.

I cannot stress enough HOW BAD an idea this is. Have you not been reading the news about TJ lately? Open drug wars on the streets, gun running, kidnappings, executions of police officers.... Pres. Calderon just sent several thousand Mexican troops to help keep peace in the city.
Right now, Law Enforcement in TJ WILL NOT FUCK AROUND. They will throw your pasty white American ass in jail and keep you there until they decide they have time to deal with you months down the road. By then, you'll have been ass-fucked so many times even Hillary Scott will say "Daaammmnn!"

Stick with Craigslist for cheap whores to practice your photography skills with. An amateur going out of the country with immoral intent and no clue as to the local laws and society is a Darwin Award waiting to happen.