 [ Symptoms ] after anal sex i experienced extreme nausea cold sweats and lethargy   no other symptoms was this related and why [ Disease ] this sounds like some of the symptoms i experience before i have an ibs irritable bowel syndrome attack my ability to regulate my body temp is poor i cramp i feel nauseous or faint and sometimes have loose or painful bowel movements if you do not have a history of ibs perhaps this is your body is response to anal penetration  i know i feel a bit logy the few times after i have done it