Premature ejaculation is when ejaculation occurs before the desired time. Anejaculation is the condition of being unable to ejaculate. A short recovery period may allow partners to continue sexual play relatively uninterrupted by ejaculation. Others may do it by relaxing the area around the penis, which may result in harder erections especially when hyperaroused. Within 24 months of the first ejaculation, the semen volume and the quantity and characteristics of the sperm match that of adult male semen. Ejaculation usually begins during the first or second contraction of orgasm. Main article: Semen quality. Nottingham University Press.
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