Premature ejaculation

When ejaculation during sexual intercourse occurs without any sense of voluntary control and within a minute or so of insertion of the penis, it may be termed rapid because the time available for sexual pleasure is quite limited for both people.

Although a few men tend to ejaculate rapidly as a response to anxiety or stress, most men who ejaculate rapidly have done so consistently from their earliest experiences with a partner.

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Original text from the CDC public domain document at http://www.cdc.gov/nccdphp/drh/Africa_pdf/Chap_10.pdf