OK, this is weird, but given the tantric symbology in it, I'm guessing the name "karezza" wasn't an accident.
It's fine to say "no," but not all of today's young porn addicts have "issues" other than overconsumption of porn. Sexology spin at its finest.
A forum member has created new English versions of both Karezza: Ethics of Marriage by Stockham and The Karezza Method by Lloyd. They can be found here: FREE sacred sex classics. Well worth reading. Enjoy!
[Note: This image is the cover of the French translation, which, unfortunately, is not available through this site.]