Its completely normal, when you are cold, feeling anxious or are close to orgasm either through intercourse or masturbation. You don't actually have to feel cold for your balls to retract, but your balls will decide what is the best temperature for sperm production. I suggest you wear looser underwear to give you a bit more space so they are not always pressed up close against your body, and if you can sleep naked. Also you can massage your balls, to stretch out your scrotum a bit. Either way, retracting balls is normal - its what they're meant to do. Weird, but that's being a guy for you
yes
It is stretchy for many reasons, one of them being this: Depending on weather conditions, testicles may retract into the body (shrinkage) for warmth. The scrotum has to be elastic to allow this to happen... hope this helps?
They retract their body's into their shells
The testicles are outside of the body because the optimal temperature for fertilization and operation is below that of standard body temperature. This is why wearing "whitey tighties" may cause sterilization (aka they hold the testicles too close to the body which is too hot).
Testicles are held in the scrotum which hangs them outside the body where it is cool enough for spermatozoan production. The function of the testicles is spermatozoan production.
no its normal for men
Unless you are very young, your testicles should not go inside your body. Your testicles started out inside your body, but descended into your scrotum through the inguinal canals before you were born. Those canals should close up long before you reach puberty. If your testicles are able to go back through the canals into your body, you should go to the doctor and have it check out. Sumo Wrestlers, who are generally selected at a very young age, practice 'tucking' their Testicles into their body. When they Wrestle this is a means of protecting them from injury. Continually pushing the Testicles through the canal opening prevent it from closing during maturation of the body.
Cold, fear.Note that the testicles do not shrink, it's the scrotum.When it gets too cold for the sperm the testicles retract intop the body for heat and come back down when it warmer. They can't stay inside the body always for the bodyheat is too warm for the sperm.
They retract their tentacles into their body stalk.
testicles
He gets on top and lets his testicles out of the sacs that keep the testicles in the body. The testicles reach inside the female's reproductive organs and the testicles transfer sperm from the male to the female.
The testicles are outside of the body for temperature control. The sperm develop best when the temperature is lower than the body temperature. If the testicles were kept at body temperature, the sperm would not develop correctly. The body has an ingenious temperature control mechanism, as well, for the testicles. If it is too hot for them, they descend and hang further away from the body. If it is too cold for them, they come up closer to the body!