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20 answers

To make the temperature just right for sperm production.

2007-05-16 02:56:54 · answer #1 · answered by Hand In Cup 1 · 1 0

The testicles are kept on the outside of the body because the ideal temperature for spermatogenesis, or the creation of new sperm, is slightly lower than that of your resting body temperature. Notice how the scrotum retracts and relaxes in reaction to temperature changes. As to the second part of your question. Have you ever seen the picture of the sleeping gorilla in the jungle with one hand by his throat and the other by his genitals? This is an example of the built in self-defense mechanism in the Simian and Homo lines. I wouldn't worry to much about getting "hit in the balls" they're really quite durable, and, based on the above example, your body will probably get you out of harms' way before you know it.

2007-05-16 10:09:31 · answer #2 · answered by kropdawg 2 · 0 0

Because sperm can't survive at body temperature. Testicles need to be kept outside the main body so the sperm stay cooler.

Likely the horrific pain of testicles being hit is a survival mechanism for sperm also. To keep the male ever protective of his "private parts" from all potential danger.

2007-05-16 09:58:35 · answer #3 · answered by Joan H 6 · 3 0

You have asked the question backwards. As you now know, to make sperm properly, the mammalian testes need to be slightly cooler than the rest of the body and are, therefore, positioned on the outside.

So, your question should be: "Given that the testes need to be outside the body, why are they so much more pain sensitive than the other appendages, like the fingers?"

The answer is that evolution has made them highly pain sensitive in order to make sure they are carefully protected by their owner. Think about it: it hurts to bang your finger, but apparently not as much as getting hit in the groin. And so, a male bangs his fingers over and over again, cutting them, smashing them, crushing them in doors, and so on. But guys couldn't do that with their testes because you can still reproduce if you lose some or all of your fingers, but men cannot reproduce if they lose their ability to produce sperm.

Consequently, any male who is born who does not feel lots of pain when he gets hit down there, won't be as protective down there, and will run the risk of damaging his reproductive chances. Over time, the males who did not feel pain in their testes and who were injured as a result, have gone extinct.

Thus, the overwhelming pain is to protect the sperm production, which, from an evolutionary standpoint, is more important than protecting fingers or toes.

2007-05-17 16:06:17 · answer #4 · answered by 62,040,610 Idiots 7 · 0 0

the fine muscles in the scrotum expand and contract to keep the testicles closer or farther from the body to regulate temperature and have more precise control over sperm production. males' testicles are (on land at least..) pretty much universally situated outside of the body - pretty good evolutionary device, really. my sperm still seem to work. thousands of years from now, maybe we'll evolve a turtle shell down there or something to help deal with the pain you were talking about

2007-05-16 09:59:33 · answer #5 · answered by Anonymous · 0 0

Testicles are on the outside because sperm don't survive in warm temperatures.

Nature doesn't care how much pain you go through, as long as you reproduce. Which is also why sex feels good and childbirth is painful.

2007-05-16 10:02:40 · answer #6 · answered by newplanet 2 · 1 0

As Biblins says its to keep them, or rather the sperm inside them, cool. Sperm is best at a slightly lower temperature than normal body temp. Not sure of the exact temperature but I think its round about 35oC

2007-05-16 10:00:03 · answer #7 · answered by Colin H 3 · 0 0

They are outside becasue the way they are designed they need to maintain a consistent temperature. The will move away from and closer to your body to regulate temp. They are sensative because of the nerve concentration. Unrelated.

2007-05-16 09:57:54 · answer #8 · answered by dismuhghettoname 4 · 0 0

Quite a few people have given the right answer: because the body temperature is detrimental for spermatozoa.....one of the survival mechanism for testes (and penis) is that it is protected by your thighs and in a fight you do tend to bend down shoving them out of the way......at least that is what animals like dogs (or any quadrupeds) do. But they are vulnerable, hanging out like that........so that it is almost an instinct to deflect any move if any one makes towards them........unless you allow a sexual advance, that is.

2007-05-16 22:16:04 · answer #9 · answered by straightener 4 · 0 0

To do with a delicate balance of temperature control for the optimum production and viability of sperm

2007-05-16 15:03:41 · answer #10 · answered by Anonymous · 0 0

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