Good question-As its the second most private thing we all do alone. The fantasy being in ones head allowing the moment to be without pediment or distraction.
How many? oh how many times once a week! All part of a full sex life, also helps after I've written a hot scene on the PC and the wifes not home to read it through with me <wink>

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Byron 2002.
Why do all the dead men waste so much time with hate when we are but a short time here.