What does spermarche signify in male adolescents?

Spermarche refers specifically to the first occurrence of ejaculation in male adolescents, marking a significant milestone in male sexual maturation. This event indicates that the male has reached a stage of puberty where his reproductive system has begun to function, allowing for the production of sperm. This is a crucial developmental stage, as it signifies not just biological growth but also typically coincides with the onset of increased sexual awareness and changes in social behavior related to emerging masculinity.

The other options identify important milestones in human development but are not relevant to spermarche. The first occurrence of menstruation is known as menarche and is specific to females. The onset of puberty is a broader term that encompasses various physical changes that occur during adolescence in both genders. The development of secondary sexual characteristics includes changes such as the growth of facial hair and deepening of the voice in males, which occur alongside spermarche but do not define it.