Books like The Gay Man's Kama Sutra
Terry Sanderson, Kat Harding
The Gay Man's Kama Sutra is 144 pages, about 2 hours 38 minutes at 250 words a minute.
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365 Sex Positions 6.9 h 
The Best Sex Positions Ever! 2.4 h Bar height shows length. Estimated at 250 words a minute.