Probably prostate: This gland secrets fluids into the ejaculate and is anatomically adjacent to the rectum. Your symptom is one I have never heard, and a urologist would know tha answer. Perhaps the secretory process squeezes the prostate capsule causing spasm that takes time to relax.
Answered 4/3/2013
5.2k views
Pelvic floor spasm: Occassional spasm is not uncommon. Can be relieved by sitting in a warm tub of water.
Answered 4/24/2015
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