The genitals are the outer sex organs — the sex parts you can see on the outside of the body. Humans have them; many animals do too. For a male body that means the penis and the skin bag under it; for a female body, the outer sex parts. The inside passage is not really an outer organ, though people sometimes lump it in when they speak loosely. This is the usual noun in hospitals, biology class, and careful news: clear, and not a swear word. With children, people often say “private parts” instead. Though actually, speakers stretch the edge a little and talk about the whole area, not only the organs. The describing word is genital, without s. It is not gender (being male, female, or another identity) and not genes (the tiny instructions in the body).