From Other Minds: The Octopus, the Sea, and the Deep Origins of Consciousness by Peter Godfrey-Smith:
Cuttlefish sex is a peaceful affair by the standards of the animal kingdom. They mate head to head. The male attempts to grasp the female front-on. If she accepts him, he will envelop the female’s head with his arms. Having reached this position, there are a couple of minutes of stillness. Apparently he is blowing water at her with his funnel during this period. The male then uses his left fourth arm to take a sperm packet and place it in a special receptacle below the female’s beak, and, with more rapid motions, he breaks the packet open. They separate.