In men, orgasm is usually accompanied by ejaculation. Ejaculation consists of sperm emission and expulsion. Sperm expulsion mandates multiple contractions of the muscles that surround the urethra.
Unless you are meaning something else, those contractions are the muscle twitches in the perineal region.
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.