Get one male. It keeps the girls happy and creates a nice dynamic in the flock. All you have to do is collect the eggs daily and refrigerate so they don't even start to incubate in the first place. Ducks usually lay eggs for several days and eventually they decide to incubate. That is usually when they have 8-20 eggs together. These eggs will not develop until they actually start to sit on them 24 hours per day. So you collect daily nothing with happen. My boy has all the fun in the world and the girls love it. No babies here until I let them.