There was some knowledge to take away but the limitations made it hard to read. Its outdated, medicalized/DSM focused, cis-hetero dominated, trans phobic, among many other limitations. If diagnosis is important for you and your practice, then there will be a lot to take away. Very limited critical capacity in talking about sex and sexuality for all genders or in taking a holistic view. I would HIGHLY recommend rounded this out with other sex therapy texts and authors.
If you're looking for the medical model's overview of sex therapy and sexual disorders- this is a good overview for you. Some of the messaging is sexist, transphobic, and definitely not holistic. This book should be read in addition to David Schnarch or other MFT works for a better rounded approach to working with sexual disorders.