I guess I had never thought about it before, but I can understand. My blog has some religious info on it so I could see some people not wanting linked to mine if they have different religious views. Thinking about it from my point of view too, I would like to have a look at the blogs that were linking to mine, just to make sure like AmyR said they aren't inappropriate, etc.
I was actually going to put up a list of blogs that I frequent today, so I will probably be sending out emails asking for permission.
Jenny Mick :)
Check out my blog... Create Everyday
(updated daily sometimes more than once a day)