What Causes Painful Ejaculation And Orange Mucous Like Discharge?

Hi there,Three times in the last two months I have had painful ejaculation and found orange jelly like bits in my semen. They dry to become quite hard, almost like beads or crystals - and the pain is caused by passing these bits. About 3 or 4 ccame out each time.I had tests for STDs 4 months ago and all were clear.I have had slight pain around the groin area for a few months - nothing too serious, more like a dull ache every now and then. No pain on urination, no discharge.Any ideas what this could be?