Good Day and thank you for being with Healthcare Magic! I would suggest doing a urinalysis to check for infection. A semen analysis with culture would also help determine if there is an infection. Most common cause of brownish discoloration of the semen is still blood brought about by inflammation and rigorous sexual activity. Pain in the testis could be inflammation also from trauma and will resolve with rest and adequate pain relievers. I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications at: http://www.HealthcareMagic.com/doctors/dr-manuel-c-see-iv/66014 I would gladly help you. Best wishes.