sexual character
noun
(Usually in plural) any feature that is characteristic of or peculiar to one sex or the other.
- primary sexual characters, the gonads and genitals; secondary sexual characters, sexual characters other than the gonads and genitals, such as the beard in human males and the distinctive plumage of many birds..
Origin
Late 18th century; earliest use found in John Hill (bap. 1714, d. 1775), physician and actor.