The structure that produces sperm in the human male is the:

1. Testes lie outside the abdominal cavity in the scrotum. 2. Lower scrotal temperature (~2 °C below body temperature) is required for sperm production. 3. The vas deferens, urethra and prostate are accessory ducts/glands, not sperm-producing organs. _Source: syllabus Science, Ch 7 "How do Organisms Reproduce", §7.3.3_