how could i have been so blind! youre right! have to say as much a fan as i am, the cut in half version is pretty uninviting. at least they left out the pubic hair on that diagram, some of them actually feature pubic hair with an arrow and a label and all. french diagram probably.
whilst it does have veracity and momentum i feel it is less about the sea and more about emotional intensity, you see how his elbow is touching the small of her back? it looks like hes in front but thats just perspective, they are actually connecting and it is personal, it is almost.... naughty.