Neutering or Spraying
It's wise to consider if you will have your cat neutered or sprayed. By sterilizing your cat you can prevent a lot of problems.
Un-sterilized cats are more aggressive and territorial, more likely to develop testicular or ovarian cancer, and female cats tend to spray. Spraying (also called marking) is when a cat sprays a small amount of urine to mark territory. This is territorial behavior, not a house-training issue.