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Intro. 1. What is testosterone It is a male sex hormone (although it also exists in girls, but in smaller quantities). It is produced mainly by the testicles in boys. It is responsible for the physical and sexual changes that occur during puberty. 2. Main functions in boys Muscle and bone growth → that's why boys get stronger during adolescence. Development of genitalia → enlargement of the penis and testicles. Hair growth → facial, body and pubic. Voice change → becomes deeper. Increased libido → sexual desire. Sperm production → appears in late adolescence. It also influences energy, mood and confidence.

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@Sinnombre