Main article: Male reproductive system (human) Partially shaved erect male genitalia. 1. Testicles , 2. Epididymis , 3. Corpus cavernosa , 4. Foreskin , 5. Frenulum , 6. Urethral opening , 7. Glans penis , 8. Corpus spongiosum , 9. Penis , 10. Scrotum . The human male reproductive system is