Originally Posted by Lintama

OMG! Kittykat you are in for a shock. Keeping an entire male indoors is definitely madness. I presume he is only a kitten as present. Once his hormones kick in, he will almost certainly start spraying everywhere and unless your sense of smell is non-existant, your house will stink and you will never get rid of the smell from carpets, floorboards, etc. no matter how much you clean.
Why on earth also would you not neuter a female. Would you be prepared to put up with the howling and screeching from her when she is in season? She will 'call' almost constantly for about a week so you would have to have very good ear muffs and what about the neighbours!! It is positively wrong to keep her entire and not mate her. It is stressful for her to call on a regular basis and not be mated. Neutering any pet cat is by far the kindest thing you can do for them. They become much more content and happy without hormones raging through their body.