What is the author's style in The Ethical Slut: A Guide to Infinite Sexual Possibilities by Dossie Easton?

This book was written in the 1990s in America. It comes out of San Fransisco, California. While the majority of Californians are heterosexual, San Fransisco is famous for its protective attitude towards the minority of practicing homosexuals and bisexuals. The authors are both women. This is a collaboration, which is not unheard of but is relatively unusual within the world of writing. Normally, editors are the only other person involved with the author's writing of a book.