I only last 3 minutes in sex. is that a good time and if not how can i improve that?

Premature ejaculate: 3 minutes would be a great time if you were running a mile. Infrequent sex would often lead to premature ejaculation. Some suggests that using a mild anesthetic gel would slow down the process but make sure that it does not numb out all of the sensation. Squeezing the head of the penis gently may also work. A sexologist may be able to give a better answer. Good luck.