A practical book on adult sex education that deepens understanding of sex in the modern age. - Title: Etiquette of Adult Sexuality - ISBN: 9784334043070 - Price: 760 yen - Contents: Content related to adult sex education - Authors: Shingo Sakazume, Risa Fujimi Thank you for viewing. This book clearly and specifically addresses the often difficult topic of adult sexuality, and I highly recommend it to many people. I purchased several copies, and this one is new, but it has been stored for several years, so there may be some age-related deterioration. It will be shipped via Yu-Packet Post Mini.