What causes the s*****m?

Question

to loosen and tighten?

Answer 1

the s*****m drops down to stay cool, and to tightens up to get warm because sperm can only be made at certain temps (lower than normal bady temp)

Answer 2

groinal warming. lol

Answer 3

Temperature and physical activity.  They need to stay within a specific temperature range for healthy sperm production.  If too cold, the s*****m contracts and pulls the testicles closer to the body for warmth.  Too warm, the s*****m extends to keep the testicles away from the body's heat to try to cool them.  During physical activity, the s*****m may contract to keep the testicles from banging around and becoming injured.

Answer 4

well when its cold it tightens and when its warm it looses it keeps the sperm cells at the right tempurature they need to be to live...

Answer 5

the s*****m is a musle that loosens and tighten when it needs to. it helps keep the testicles about two degrees cooler so they can produce sperm. sometimes when you are cold or scared it tightens up and when you are hot it loosens.  

Answer 6

Heat/cold and sexual arousal.

Answer 7

Temperature and sexual arousal

Answer 8

The scrotal sacs tend to loosen when your body or the weather begins to heat up or you've just recently ejaculated. This is due to the fact that once the sperm has been pulled from the testicles, they loosen. When your s*****m gets hot, they pull away from the body to keep the right temperature for sperm production. The scrotal sacs tighten when you're on the verge of ejaculation or your body or weather is cooler. When you're about to ejaculate, the s*****m pulls up to the body so the sperm can be taken from the testicles. When it's cool, the s*****m pulls up to the body so the heat from the body can keep them at the temperature necessary. Hope this helps.