My husband gets severe leg cramps after when he reaches orgasm.what can he do to get rid of the pain in his legs at the back not front of the legs.

Lack of blood flow: May be a correctable vascular problem , a type steal at ileac vessels , known to occur upper extremity use causing syncope , ' subclavian steal' get vascular work up done on him by your doctor. If it is true we can name ileac vessel steal this syndrome with our names names get vascular work up done , if true placing simple endovascular stent will cure the problem good luck.