Zupančič’s What IS Sex? is more than just a guide to thinking about sex and the subject of sex because when we are inevitably thrown into chaos by this task she helps us to preserve clear thinking. The subject of sex is and always has been an important topic for philosophy and psychoanalytic theory. Zupančič’s approach offers something different to previous discussions in that she not only reinvigorates sex at the intersection of philosophical, psychoanalytic and ontological inquiry, she also considers sex in terms of a symptom emanating from this very engagement. Here sex is no longer an ontological impasse but rather a signifier which tantalises the gap between knowledge and the subject.