Main Strip Niagara
Bluezone,
For tourists the "Main Strip" is Clifton Hill, that's just up from the Falls and is where you find all the museums like Ripley's Believe it or Not, Tussaud's Wax Museum, Harry Houdini, etc.
For the "adults" the main strip is Lundy's Lane, that's where you find the main Gentlemen's Clubs and MP's
There are not any XXX Theatres or peep shows in Niagara, but then again I'm in the GTA and only going on memory.
Hope this helps