Portuguese Man of War: The Portuguese Man of War reproduce sexually since there are both female and male Man of War. They produce sperm and they produce eggs. The sperm will fertilize eggs in the water column to produce larvae, which grow into bigger Portuguese man of war. They grow from those individual cells is by asexual division of those cells and they produce all those individual three types of animals that live in this one colony and drift around the oceans, stinging things and eating things as they go.