Paul Saladino· MD
the testicles are quite interesting they're very dynamic they move up and down to regulate the temperature of the testicles because sperm are are very fragile um contrary to popular belief and if they're too hot they're in and they're too close to the body they're not going to be able to mature as well and if they're too cold they're not going to be able to mature as well so testicles move up and down to control the temperature