My cat has started peeing underneath the computer desk on all the cords!! He is fixed and has had a tendenectomy done (three years ago)! It is really bad.. I have never had this problem before!
I don't know what a tendenectomy is, but I'd say your boy needs to go to the vet for a check up and to rule out any type of infection. Until then, I'd put a litter box in that spot for him and be sure to clean the area with an enzymatic cleaner.