My girlfriend gave me this book and I wasn't quite sure what to expect, but I loved it. It's a very open-minded look at modern love. It's not a self-help book at all but, having said that, I actually found it very helpful. Each chapter looks at love from a different angle: why it brings unhappiness, why it makes people mad, how love and hate are related, whether gender affects the way we love. Although it's clearly been written from a female perspective, there's nothing in it to alienate men. In fact she makes it very clear that the problem isn't between men and women but between humans in general. The examples she uses are from all over the place; it made me want to watch a lot of the films she mentions again. Even Moulin Rouge, which I hated the first time. It also made me want to read Freud, which is saying something.
Because she comes at the subject from so many different angles I'd imagine it would make a good read no matter what your romantic set-up is. She talks about unrequited love, swinging and bisexuality, but she's also good on the subjects of marriage and monogamy. I'd recommend it to anyone who's ever had questions about love. And I imagine that must cover a lot of people!