The first sex symbols refer to the male and female genital organs, while the second sex symbols are mainly manifested in the differences between men and women in terms of height, body shape and other aspects after puberty.
1. First Sex Characteristics: The first sex characteristics refer to the differences between male and female genitals. For example, males have testicles, vas deferens, epididymis, penis and prostate; females have vagina, vulva, fallopian tubes, ovaries, oviducts and uterus. The first sexual sign is innate, and is the first basis for distinguishing between male and female sexes, and is also called the primary sexual sign.
2. Secondary sexual characteristics: Secondary sexual characteristics refer to the different changes that occur after men and women enter puberty. In males, they mainly manifest in the growth of a small beard, change of voice, appearance of body hair, growth of a laryngeal knot, enlargement of the testicles and penis, and the non-development of breasts; in females, they mainly manifest in the development of hips and breasts, the laryngeal knot does not protrude, the pelvis becomes wider, and the appearance of pubic hair and armpit hair, and so on.
Besides, other physical differences between men and women that appear after puberty can also be regarded as secondary sexual characteristics, such as differences in skin and height. If you feel unwell, it is recommended that you go to a regular hospital in time for treatment and early recovery.