It has to do with temperature control. The scrotum acts like a thermostat, regulation the temperature of the sperm. You may notice that in cold water, the scrotum retractst the testes closer to the body. The reverse happens while exercising or sweating. Sperm cells survive best in just under body temperature. If the testicles were inside the body there would be no form of temperature regulation.
NO Absolutely NOT.
Sucking, rubbing ect..
It is not normal for one side of the testicles to be numb.
Testes (testis is singular) and testicles are the proper names for "balls."
To give the illusion that they are hiding something.
The zip should be on the left side.
It doesn't matter! As long as it looks like a mens. The buttons do go on the left but not zippers.
They wore curls on the side of their heads with a cap.
nothing happens to the testicles themselves. however, if they are overheated for a prolonged period of time it can kill the sperm in them. but a hot day does affect your scrotum (your sack)..it makes it go all soft. this is so your balls are further away from your body so that they can get cooler.
hairy testicles
None.. Your testicles produce sperms constantly.
appendix or kidney infection.