well, don't breed more than you can afford lah... everything is costly nowadays, and remember, human need at least 200 sq ft per person to live comfortably. that's why many urban couple opt for just 2-3 children esp those living in small spaces. another thing, don't breed if you don't want to "handle" your children, and end up a nuisance to the country!

by the way, human neutering procedure do exist
vasectomy for men and hysterectomy for women

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Cats are precious creatures that enhance one's life. Respect them, take good care of them, and above all, love them. Their love, affection and attention will be your reward.