Ideally I would give this book two and a half stars, but I felt generous and rounded up to three. It isn't that the book is bad, it just isn't that illuminating. There is relatively little in here that most adults have not thought of. On the plus side, it does offer a good refresher course from a woman's perspective, which is good for people (especially men, obviously) in long established relationships.
Any time there is a list with 269 items on it, it's a given that some tips will be better than others, but most of these are common sense and general knowledge. I reiterate, though, that it is best seen as a "refresher course" for people stuck in a rut. The book has some illustrations which are generally R-rated. It also refers to several websites, at least one of which is not current. (I didn't look all of them up, so I can't vouch for the rest.)
The book takes about 30 minutes to read, and while I don't overwhelmingly endorse it, it isn't an utter waste of time. There are probably better selections available, so despite the book's low cost, I would continue shopping if I had to do it over again.