The medical definition of premature ejaculation is the persistence of recurrent ejaculation with minimal sexual stimulation before, on, or shortly after penetration, and before the person wishes it to occur. Ejaculating before you are ready to or have satisfied your partner.
Premature ejaculation is very common.
It can also occur in association with erectile dysfunction. Treating the latter will often provide a solution to the former. Most patients with P.E. have no underlying medical problems. Also, often it is the partner who fails to achieve maximal sexual fulfillment. Secondly, premature ejaculation tends to be a lifelong problem until treated.