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After this peak, the magnitude of semen the penis emits diminishes as the contractions begin to lessen in intensity. You might also like these videos:. In stallions , ejaculation is accompanied by a motion of the tail known as "tail flagging". At that point, under the control of the sympathetic nervous system , semen containing sperm is produced emission. Dr John Dean, netdoctor. Although uncommon, some men can achieve ejaculations during masturbation without any manual stimulation. Dunbar; M.