Severe pain in groin region just before orgasm extremely severe pain?

This might be blood: This might be blood contained in the vascular pelvic venous system just prior to orgasm also known when unrelieved by orgasm as pelvic congestive syndrome. If the pain did not prevent orgasm and relieved the discomfort, voila! if the pain persisted post-orgasm or prevented the "climax", see a gyn md for a expert analysis by exam.