1. human chorionic gonadotropin

2. homologous

3. scrotum, gubernaculum

4. perineum

5. seminiferous tubules

6. epididymis

7. pampiniform, countercurrent heat

8. ejaculatory duct

9. fibrin

10. lacunae

11. interstitial cell-stimulating hormone

12. testosterone, libido

13. crossing over

14. acrosome

15. bulbospongiosus (bulbocavernosus)

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