Desexing removes the sexual urge from both male and female cats. Unless you are serious about showing or breeding, desexing is recommended for all pet cats.
Owners are often tempted to have at least one litter from their female cat. Breeding is an expensive and time consuming process which requires a lot of hard work. It is not recommended without serious study of the involvement you will be required to give. It can be very difficult to find suitable homes for the kittens.