While I agree that some of the questions are repetitive, some of them actually have different answers.
Now, asking about K-girl screening every week is overkill, but if everyone did a search every time prior to asking a question, we wouldn't have much to talk about because literally everything has been discussed before.

Over the past several months I have noticed that folks who don't visit the discussion board regularly tend to ask questions that have already been discussed ad nauseam in previous threads.  For example, only recently someone asked how one should go about securing references in order to contact K-gals.  

A nice feature would be that as one is typing the subject in a new post a drop down menu appears that dynamically matches words and finds threads from previous posts.  We've all seen this feature when we search for items on Google or Amazon.  There'd be lot less clutter on the discussion boards if the web developers implement this feature.

I guess it's a good idea, but in the kgirl example you cited, it wouldn't help much. The person asking the question would get directed to a bunch of hostile threads with guys saying, "Idiot!" "Fuck you!" "Go figure it out for yourself!" He would find very few threads with genuinely helpful information.

Depends on the implementation and how good a search algorithm the devs right code up.  The benefits would be less clutter on the boards, and it would probably free up space on their servers.

is if these old threads were ranked (the way Amazon does it) by how helpful they are to the readers. A thread that has real, actionable information would get 5 stars. A thread that is full of insults would get zero stars.

On the other hand, that might also be a problem. The most valuable threads also tend to be the ones where people complain that we are giving away too much information, especially on the kgirls. Tough to reach a safe and healthy balance.