Books like The Enlightened Sex Manual
David Deida
The Enlightened Sex Manual is 177 pages, about 3 hours 15 minutes at 250 words a minute.
7 books to read next
How long each takes
The Multi-orgasmic Man 4.4 h 
The Art of Sexual Ecstasy 8.3 h 
The Art of Sexual Magic 7.0 h 
The Multi-orgasmic Couple 4.1 h 
Healing Love Through the Tao 5.6 h 
Kama Sutra 2.9 h 
The Gift of Sex 6.5 h Bar height shows length. Estimated at 250 words a minute.