most likely because most people are much more comfortable IM'ing or emailing someone a link to something funny, than to an adult website.
I have a friend that sends out 'funnies' She used to send it cc'd instead of bcc'd...... it was a HUGE list (I imagine that in the last year it has only gotten bigger).... and of course some of those people will have their own lists to fw: it too, and on and on.
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