Self

Self is a great book from Yann Martel that explores the topics of sex, love, identity, and ambiguity. It is about a young male writer that wakes up one morning as a woman. The book is like an autobiography and I love the dialogue in it. Many characters speak another language and instead of having everything in English, the dialogue runs simultaneously down the page, English on the right, and the other language on the left. There are also no chapters in this book which makes it quite different from many books of fiction. If you liked the style of writing in Life of Pi, then you will probably enjoy the writing in this book.
Just a warning, there is a violent rape scene in this book and although it is good to talk about topics like rape, the character does not really deal with the rape because of events in the book (from my memory).