Men with bigger testicles produce more sperms and as a result can be more fertile.
A 2013 study have shown that men with bigger testicles are more prone to high blood pressure and heart disease.
One study has shown that men with smaller testicles make better dads. According to the study men with larger testicles were less nurturing to their kids.
Some people think that bigger testicles are a sign of higher levels of testosterone. Others don't agree. See how to tell if a man has high levels of testosterone.
According to one theory people who already have diabetes or heart problems might experience an increase in the size of their testicles.
In one study it was shown that men with bigger testicles might be more likely to cheat. See why do people cheat.
In one study it was shown that people with smaller testicles can have problems sleeping well and can experience insomnia. See how to have a good night sleep.
Men with larger testicles might have a stronger sex drive because of their higher levels of testosterone. See also natural ways to increase testosterone.