Many many years ago my mother, who was very fond of cats, took in a kitten, despite my father's disapproval at anything which was likely to make a mess around the house. After a couple of weeks she took her to the vet with a view to having her spayed as she thought that it would make her cleaner. The vet put the cat on his desk, lifted up her legs and said, "It's a tom". My mother replied, "Well, we're here now, so you might as well just cut them off". I can still picture, almost 50 years on, the look of sheer reproach the cat gave me as we took him home in his basket afterwards.