Yes, it is generally recommended that pet cats, including the Bombay Siamese Mix, be sterilized. Sterilization, which doesn't cost as much and includes spaying for females and neutering for males, has several benefits. It can prevent unwanted litters, reduce certain health risks such as uterine infections and breast tumors in females and testicular cancer in males, and can also help curb behavioral issues related to mating instincts, such as spraying, roaming, or aggression. Always consult with your vet to determine the best time and approach for sterilizing your cat.