How do you tell if your male cat has been neutered?

A neutered male will no longer have testicles. Bear in mind if your cat has just been neutered the testicles still may be visible. It takes around 6 weeks for the hormones to calm down, so the testicles will shrink over this period. A male cat has a larger gap between the anus and penis, whereas a female cat's vulva is situated closer to the anus.