I THINK IT MAY BE THAT STARY CAT AND YOUR MALES ARE LEAVING THIER POOP OUT IN THE OPEN TO SHOW HIM THAT THEY RULE, AND IF YOU DONT BELIEVE THEM, THEN HERES THIER POO TO PROVE IT!!!
MY MALE CATS ALL NEUTERED SOMETIMES DO THAT TO PROVE THAT THEY ARE KINGS OF THE CASTLE, SO TO SPEAK!!!