I  want to mention that  www.answers.google.com  discourages or
removes the information about adult websites so therefore I want to
know that is there any alternative available in the internet so as to
locate or  find   "any"  information  about  adult websites  through
that  alternative  in the internet ??

Just type "porn" in the Google search box.  You will surely get lots
of adult web sites.

There is a special search engine for adult sites. It's called
"Booble." I cannot post an active link here, but if you append ".com"
to the word "Booble" you'll hit paydirt.

Here is my answer to your question.
Let me know if my answer is what you are looking for.

There are many "adult search engine" in the web.

Here is how you can find the list of adult search eggine.

Type "adult search engine" in the google and it will show you a list
of adult search engines. As "pinkfreud-ga" mentioned, booble is one of
them.