The first sign of puberty in boys is subtle -- an increase in testicle size. About a year later, the penis and scrotum start to grow. Semen can be released during an erection when they are awake or when they are asleep.
Finn was 12 years old at the start of the series and is progressively growing older realistically. As of "Mystery Train," he turned 13 years old. Finn is shown going through puberty throughout the series. This is seen whenever when he is screaming - his voice cracks. Finn's voice is noticeably deeper at 13 than it was at age 12, as a result of his voice actor aging. Episodes with early production codes have Finn with a very childlike voice such as "The Enchiridion," "Prisoners of Love," "Evicted," and "Ricardio the Heart Guy."
Why Do Voices Crack During Puberty animiertes doujinshi
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