Cephalopod
With a few exceptions, Coleoideans live short lives with fast growth. Most of the energy from their food is used for growing. The penis in most male Coleoidea is a long and muscular end of the vas deferens (tube for sperms) used to transfer spermatophores (sperm packages) to a modified arm called a hectocotylus. That in turn is used to transport the spermatophores to the female. In species where the hectocotylus is missing, the penis is long and able to extend beyond the mantle cavity and transfers the spermatophores directly to the female. The females lay many small eggs in one batch, and die afterwards. The Nautiloidea, on the other hand make a few large eggs in each batch, and live for a long time.