There are different causes of premature ejaculations, but the main cause seems to be men's inability to handle the pleasure they experience during sex. That is what causes the men to orgasm and ejaculate. The orgasm comes from the stimulation or arousal that men experience when they are having sex. Most men experience premature ejaculation by allowing themselves to experience sexual stimulation at a very high level of intensity.
Talking about intensity levels, it is very important for men to be aware of the various levels of arousal they go through when having sex. This audiobook is a comprehensive guide on how to handle sexual arousal and stimulation, thus enabling men to naturally last longer in bed.