There are several main methods to determine a cat's sex:
1. The distance between the genitals and anus is greater in male cats, while it is relatively closer in female cats.
2. Male cats have relatively wider noses, while female cats have narrower noses.

3. Male cats usually have sharper eyes, while female cats have gentler eyes.
4. Male cats are usually lively and active and like to go outside, while female cats are relatively mature and stable.
5. The distance between the genitals and anus on a male cat's rump is farther, while it is closer on a female cat's.