The reproductive system of an organism, also known as the genital system, is the biological system made up of all the anatomical organs involved in sexual reproduction. Many non-living substances such as fluids, hormones, and pheromones are also important accessories to the reproductive system.Unlike most organ systems, the sexes of differentiated species often have significant differences. There are many advancement in reproductive techniques including Human stem cell research, IVF,Sex steroid hormone action, Stem cell research etc.