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'''Ejaculation''' is the discharge of [[semen]] (the ''ejaculate''; normally containing sperm) , stored in the [[seminal vesicles]], from the male reproductive tract as a result of an orgasm. It is the final stage and natural objective of male sexual stimulation, and an essential component of natural conception. Ejaculation can occur spontaneously during sleep, and is a normal part of human sexual development (a [[nocturnal emission]] or "wet dream"). In rare cases, ejaculation occurs because of prostatic disease. ''Anejaculation'' is the condition of being unable to ejaculate. Ejaculation is usually very pleasurable for men; ''dysejaculation'' is an ejaculation that is painful or uncomfortable. Retrograde ejaculation is the condition where semen travels backwards into the bladder rather than out of the [[urethra]].