1. Look at the cat's head and body shape. Male cats typically have larger heads and broader shoulders than female cats. Additionally, male cats tend to be longer and more muscular than female cats.
2. Check the cat's tail. Male cats typically have thicker, longer tails than female cats. Additionally, the tip of a male cat's tail is usually bent or hooked, while the tip of a female cat's tail is usually straight.
3. Feel the cat's belly. Male cats typically have a larger, more pronounced "button" on their belly than female cats. This button is actually the cat's penis, which is retracted when the cat is not aroused.
4. Observe the cat's behavior. Male cats are typically more territorial and aggressive than female cats. Additionally, male cats are more likely to spray urine to mark their territory.