GP's point is that the best advice on how to please someone comes from that person, no book can give complete insight into the way their body works. To torture

GP's point is that the best advice on how to please someone comes from that person, no book can give complete insight into the way their body works. To torture your analogy some more, imagine a car capable of explaining to you how to drive/maintain it perfectly. Like a less whiny KITT. Would it not make sense to ask the car rather than to pore over generic car manuals?