I would have given the book another star if it had separate sections for female partners of male survivors, female partners of female survivors, male partners of male survivors, and all the two-spirit/intersex combos.
This guy is really writing primarily for male partners of female survivors. This is a good beginning, but we partners need more.
It was written in 1991, and I'm not entirely sure about the up-to-dateness of the author's picture of bisexuality as being the result of unresolved sexual abuse trauma. My guess is there's a purely biological component to bisexuality, but the author couldn't have known any research findings since 1991, so he is excused on that score. (And I'm not going to go look that up just now, either.)
It does have good material on sex and love addictions, and, for polyamorous readers, he does cover open relationships in a non-judgmental way. In fact, all his addiction material is good, important reading.