Over the past 3 months, from time to time, I have got small stones or gel lumps in my sperm they are small max 1x1 mm but feel extremely painful when I am coming. They also hurt sometimes after sex when I pee I can feel that the some that did not come out with the sperm are still in the urethra and flush with the urine.  I do not have any problem peeing otherwise, just after I had sex/ejaculate.  NOTE: I been checking my kidneys for stones and they did not find anything.  I attach a picture so you can see how they look like. I can easily crush them between my fingers so more like a gel than stone.  imgur.com/a/nwqJF  What can this be?  Kind regards