Ever seen one of those forensic shows where they put a blue light over the sheets and there is semen everywhere? Generally it is quite amazing how much semen is produced - just glowing blue blobs all over the place.
But if I were to murder someone I think it would be good to give the forensic dude something to be really impressed by, not just the size of my load. How impressive would it be if I were to do an amazing Picasso like semen painting?
I wonder what would happen if there was a religous apparition that appeared under the blue light. Would worshippers come to see a semen Jesus?