I m a twenty-four year-old gay male, and I recently engaged in protected receptive anal sex for the first time in a while. I masturbated this morning (48 hours after the encounter) and my ejaculate had a slight pink tint to it. This has never happened to me. Is it possible for that my prostate is simply irritated? I recently was tested for gonorrhea, chlamidia, syphilis, and HIV, and all of them came back negative. I m rather worried about this