Hi Liz_Beth,
Maybe if enough guys respond we can answer all your questions.
1. I can't say when the Yellow Pages started with an adult section, but in the LA area, I know it went back at least to the early 1980's, because that's when I first checked them out.
My first experience with alternative newspaper classifieds ads for escorts goes back the early 1970's. They probably go back to about the mid to late 60's, because that's when most of those alternative papers first started showing up. Although, lower quality rags have been around for a lot longer.
2. Well, you named the main one- the alternative newspaper classifieds were probably the best source. Word-of-mouth too, but that was always tough because you had to know someone who knew someone. But it did act as a form of early screening because the assumption was a good client would only pass along your name/number to someone who would be OK as a client.
To show the problem with word of mouth, I met a provider that told me 10 years earlier, she'd worked in a brothel house in a nice residential neighborhood about 2 miles from my house, but I had no idea it was there. It would have saved me a lot of trouble had I known!
3. When I first started looking for escorts in the early 1990's in the LA area, $100 would buy you an hour's time with a beautiful woman. You had a lot of options at that price, though some obviously charged more. By the mid-90's, I was still paying $100, but only as a regular. The going rate was closer $150-200.
Once TER started around 1999, and the internet became the dominant means of finding escorts, there were still plenty of escorts charging $200, but the prices started moving fairly quickly towards $250, and the more expensive ones were at $300. Lots of high quality ladies could still be found at $200, however, if you did your homework.
Perhaps due to the bad economy of the last few years, thankfully, prices have somewhat stabilized around the $300 level on average. Of course, others charge more, sometimes a lot more, but I'm trying to give you an apples-to-apples comparison as much as possible.
I just remembered my very first encounter with an escort while typing this. It was back in 1976 in San Francisco at an expensive hotel. She ran past security and jumped into my elevator. I had no idea she was a hooker. Security stopped the elevator and asked me for my room key. I still had no idea what was going on. Then she propositioned me in the elevator after security left. She charged $75 for a quick BJ and I thought that was outrageously expensive at that time, (and it really was, but I was wearing a business suit so maybe the price reflected that. I was married until 1984 kept busy with GF's, so I didn't see another escort for about 18 years.
4. I first discovered TER in December of 1999, but I didn't start posting for a while. I think I registered as a member in 2000 or early 2001. I checked a couple other boards, but thought TER was the class of the field so I've stuck here.
I found it by doing an internet search for escorts just to see what would come up. I'd been burned so many times by classified ads that TER seemed like a big improvement- and it was.
5. Provider quality is very subjective, but I'd say the trend has been toward better selection and more attractive ladies. There were some great women working pre-internet, and some of them were very attractive, too. But the communication provided by TER and the internet, including the advertising sites, has really made things better for providers. This, in turn, has attracted more and better quality women.
I also think the communication has fostered an increased level of professionalism with the ladies, and definitely helped guys know how to behave and what is expected of them. Informal group standards and expectations have emerged for both the men and women- mainly from discussion boards, but also reviews.
So if I had to summarize, I'd say the internet resulted in prices going up, as well as quality. The main thing is TER and the internet removed a lot of the uncertainty. I saw a few beautiful escorts before the internet, but it was hit or miss and I missed far too many times.
6. Screening is fairly new and didn't become the norm until about 5-6 years ago. Nobody that I saw was screening 10 years ago, although I think I was asked to show a DL for the first time around then. I don't know the history of RS2K or Date-Check.
I hope that helps.