a wise man is open to learning throughout his whole life:

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Oral Caress: The Loving Guide to Exciting a Woman : A Comprehensive Illustrated Manual on the Joyful Art of Cunnilingus  by Robert W. Birch

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Pussy Eating is an art form !!!!!!!!!!!

I hadn't appreciated the nuances. Pussies are all about nuance. Yeah, I love sucking on a big mouthful of engorged lip or running the tip of my tongue up and down the clit shaft, but then there was the technique of circling the entrance to the Yoni that I had neglected or placing my hands palms up under her buttocks and lightly squeezing as my tongue thrusted into her warm hollow... and why izzit that women don't like to have their clits tapped with a tongue tip. Who do we think we are, Woody Woodpecker ?

And on the opposite side of the coin:
http://search.barnesandnoble.com/textbooks/booksearch/isbnInquiry.asp?userid=ygx1q4cPMX&isbn=1570743495&TXT=Y&itm=4