Both male and female cats spray, but it is most common in unneutered male cats. (cathealth.com)
Unneutered male cats tend to be more aggressive than females, but once neutered, either gender has a better chance of being tamed successfully. (waterlooanimalhospitalok.com)
Unneutered male cats spray very strong foul - smelling urine to mark their territory. (celiahammond.org)