I so agree w/Dan Holder. It seems no1 here is kind enough to let there pet experience total freedom so I thought I'd cheer you on. I have 3 cats. A mother, father and daughter. They are all very happy and don't come in because we're still battling fleas(ugh!). They don't have fleas but they'd probably get them if they came inside.
They hunt all the time and never even think of coming in. The tom is muscular and the mom and daughter are tiny.
I'm glad that you were able to point out the truth's of spaying and neutering. It does make your pet fat and if done too young, will create a pouch of fat on the belly and cause later health problems.
The mother is the only one fixed but we may get the tom neutered so that he stays around.
Anyways, Love Winston! I'm so glad that you're giving him the wonderful life he deserves. You truly love him^_^