Premature ejaculation is defined as.
From the first sexual intercourse, ejaculation often or always occurs before or approximately less than 1 minute after vaginal penetration (primary premature ejaculation) or less than 3 minutes (secondary premature ejaculation).
Ejaculation is always or almost always uncontrollable/delayed.
And there are negative physical and psychological effects such as worry, distress, frustration and avoidance of sex.