I am sympathetic to neighborhoods where this kind of thing takes place, but only so much. The mcmansion next door to us in Capistrano Beach is being used as an upscale drug rehab house. We were hoping for actual neighbors instead, but then again I don't see pornstars as being such bad neighbors. Perhaps we can work something out and trade our druggies for your pornstars.
I think the biggest issue with having and active business in a residential neighborhood would be traffic. Laws aside, you wouldn't want to live next door to a liquor store, but if you actually have people living there rather than an active studio that doesn't seem like it would be so problematic.

I'd think that the LA area would have different laws. Wouldn't porn shooting fall under the same rules as any other film shoots? It would seem that there would have to be regulations on film shooting in the area around Hollywood.