Feature of the adult animal, appearing during puberty in humans and distinct between the sexes, although not part of the reproductive system.
Note: Examples include enlargement of the female breasts and sex-specific patterns of body hair, such as facial hair in the male and the male or female
pubic escutcheon.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 802 (https://doi.org/10.1515/pac-2015-1202)