 (Image courtesy of Cancer Research UK) Ureters are a component of the urinary system and are thin tubes of muscle that carry urine from the kidneys to the bladder. In a human adult, the ureters are usually 8–12 in long and very small in diameter (~0.15 in).
 (Image courtesy of Wumingbai) Ejaculation is the discharge of semen from the male reproductive tract as a result of an orgasm. It is the final stage and natural objective of male sexual stimulation, and an essential component of natural conception.
 Puberty is the process in which a human child’s body matures into an adult capable of sexual reproduction. It is initiated by hormonal signals from the brain to the ovaries in females and testes in males, also known as the gonads. In response to these signals, the gonads produce the hormones required for the physiological transformation of the human body, including changes to the sex organs and the stimulation of sexual desire in people (i.e., the libido).
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