The main purpose of having external male genitalia is so that temperature regulation can be maintained more efficiently.
They are produced in testis.Testis are located outside from body
The testis is the male reproductive organ responsible for producing sperm and hormones such as testosterone. It is located in the scrotum outside the body to maintain a lower temperature for optimal sperm production.
To keep sperm cooler than core body temperature.
The testes in human males are located outside the abdominal cavity in the scrotum to maintain a lower temperature than the body to optimize sperm production. Sperm production is less efficient at body temperature.
The testes hang outside in many mammals to keep them cool. Too much warmth is bad for them.
The testes are located outside the male body in the scrotum, because sperm production requires a cooler temperature, then the internal body temperature, so the temperature can be regulated better outside the male body, in the scrotum.
epidermis
epidermis
In the intrauterine life both the testes are located in abdomen. From there the descends down and enter through internal inguinal ring and come out from external inguinal ring to the scrotum. Here the body temperature is less by one degree Celsius less. That is essential for Spermatogenesis. At body temperature Spermatogenesis does not occur. Some times a testis is missing in scrotum and is called as non descended testis. You have to mobilize the same below 8 years of age. Or there are high chances of developing cancer in it.
The gonads in the male body are actually the testis. If you do not know where the testis are located on a man, they are the spherical, sperm producing organs that are connected to the body below the penis.
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To produce sperm properly they need to be a little cooler than body temp. Being outside lets them hang or pull up tighter to adjust the temperature.