The development of terminal hair is considered one of the secondary sex characteristics.

Cellulite is a normal secondary sex characteristic that affects 80-90% of women post-puberty, typically appearing on the thighs, pelvic area or abdomen.

Cellulite is a normal secondary sex characteristic that affects 80-90% of women post-puberty, typically appearing on the thighs, pelvic area or abdomen.

Although breast appearance is definitely important as a secondary sex characteristic,breast size or presence are not involved in the legal definitions of sex and gender and are notimportant for reproduction.

Although breast/chest appearance is an important secondary sex characteristic, breast presence or size is not involved in the legal definitions of sex and gender and is not necessary for reproduction.

We evolved them as a secondary sexual characteristic, according to leading biologists.

According to biologists, beards are considered a secondary sexual characteristic since they’re (mostly) unique to one sex.

Another is that the tooth is a secondary sexual characteristic, like a peacock’s feathers or a lion’s mane.

Another is that the tooth is a secondary sexual characteristic, like a peacock's feathers or a lion's mane.

For male killer whales, dorsal fin growth is thought to be a secondary sexual characteristic as peak growth of the fin coincides approximately with the onset of sexual maturity.