Why do humans with no ovaries or testicles need to take hormone supplements to stay healthy, but animals who have been neutered are seemingly fine and often live longer than their intact counterparts?

Question

Just something that occurred to me when thinking about my elderly cat, who’s spent almost 16 years without her uterus or ovaries to no apparent detriment.

In: Biology

Answer 1

Because even though I might have lost my testicles, I still want to “be human” in the sense that I would like to be able to “be with” my wife. If no hormones I would just loose all sex drive (and other complications). When I neuter my dogs – thats sort of the point. Male dogs that have been neutered has little to no sex drive, and therefore they often become sort of lazy, just wanting to lay around and eat.