If a man lasts less than 2 minutes after penetration (all or most of the time), and/or if it leads to frequent dissatisfaction for him or his partner, he may have PE.
There are various physical causes that can lead to premature ejaculation such as erectile dysfunction, hormonal imbalances, infections or inflammation in the prostate or urethra etc.
The smooth working of physical hardware or genitalia isn’t the only thing needed for sex to be satisfying and comfortable. The mind and body, together, affect the sexual arousal phases. Some mental health concerns that can lead to PE include early exposure to sex, depression, sexual abuse and/or repression, etc.
The main symptom of PE is the inability to delay ejaculation leading to ejaculating quickly. This can lead to frustration and dissatisfaction in the man and his partner.