I heard holding and squeezing the testicles work to stop ejaculating?

Better options: That's likely to injure yourself and isn't pleasant. For premature ejaculation, a dab of an anesthetic on your glans, or a condom, may work. Your physician may prescribe a low dose of a SSRI. Or you and your partner can learn the squeeze technique, and you can reprogram your body into that of a more skillful and controlled lover -- and it's fun. Much more than hurting yourself.