sex

A sex organ or primary sexual characteristic, as narrowly defined, is any anatomical part of the body involved in sexual reproduction and constituting the reproductive system in a complex organism, especially the external sex organs; the external sex organs are also commonly referred to as the genitalia or genitals.^[1][2]
Flowers are the reproductive organs of flowering plants,^[3] cones are the reproductive organs of coniferous plants,^[4] whereas mosses, ferns, and other similar plants have gametangia for reproductive organs.^[5]