I read about 3/4, and it has stayed with me, so I'm adding it. I like books about sexual behavior but this had weird California cult sex; maybe cult is the wrong word, because they didn't pressure people to join or stay, it was marketed as a health spa kind of thing. You could freely come and go, as long as you paid (from what I remember, it was pricey). There were things like clit therapy.

So I didn't finish the whole thing but I was interested in the journey of the memoirist, a 44-year-old married, childless, woman who "sows her wild oats." 2.5 stars because it fizzled out and lost my interest at the end.