We live under a cheerful delusion that sex might nowadays be easy - because we have been 'liberated' from the hang-ups and taboos of the olden days. Yet nothing could be further from the truth. Despite a veneer of openness, sex remains an extraordinarily complicated business, hard to discuss and surrounded by shame and unspoken desires. This book provides a relief from the loneliness and confusion, explaining how sex truly operates and what it aims at. The book demonstrates that, far from thinking about sex too much, we haven't begun to think about it as deeply as we should.