Usually you cannot control it, its when a woman is someone you think is hot and she does somethingsexually arousing like spanking her ass, then you just let it go uncontrollabley.
Every man has a shotgun in their undercarriage. It has one barrel, but it can be filled with two types of ammo, urine or sperm. When a man shoots out sperm from his shotgun before sex or before 2 minutes into sex, he has prematurely ejaculated. It is one of the most embarrassing things a man can endure. Don't do it.
"No more dates with you, Freddy. This is the third time you've missed and made a mess on my belly. Now lick up every drop of that prematureejaculation!"