Select the structure of the major product in the following reaction. 
Definitions:
Perineum
An area of soft tissue between the genitals and the anus that covers the muscles and ligaments of the pelvic floor.
Prepuce
A fold of skin that covers the head of the penis in males and the clitoris in females; commonly referred to as the foreskin in males.
Cremaster Muscles
Muscles that cover the testes, involved in the reflex action of moving the testicles closer to or further from the body to regulate temperature.
Dartos Muscles
Smooth muscle fibers found in the scrotum that regulate temperature by contracting and relaxing, affecting the testicles' proximity to the body.
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