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| Ejaculation topics | 
| Aspermia • Azoospermia • Coitus interruptus • Coitus reservatus • Delayed ejaculation • Erection • Female ejaculation • Premature ejaculation • Retrograde ejaculation 
 Aspermia—lack of semen; anejaculationAsthenozoospermia—sperm motility below lower reference limitAzoospermia—absence of sperm in the ejaculateHyperspermia—semen volume above upper reference limitHypospermia—semen volume below lower reference limitOligozoospermia—total sperm count below lower reference limitNecrozoospermia—absence of living sperm in the ejaculateTeratozoospermia—fraction of normally-formed sperm below lower reference limitAnother cause of aspermia is ejaculatory duct obstruction, which may result in a complete lack or a very low-concentration of semen (oligospermia), in which the semen contains only the secretion of accessory prostate glands downstream to the orifice of the ejaculatory ducts.
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