Final answer:
The male homologue to the female labia majora is the scrotum, which serves to protect the testes and regulate their temperature.
Step-by-step explanation:
The male homologue to the labia majora is the scrotum. In females, the labia majora are large folds of hair-covered skin that serve to protect the external reproductive structures, collectively known as the vulva. By contrast, in males, the scrotum serves a similar protective function for the testes and also aids in regulating the temperature of the testicular environment, which is essential for sperm production.