The reasons why male cats don't attack female cats can be summarized as follows:
1. Female cats are generally more cautious and defensive than male cats. When faced with a potential threat from a male cat, a female cat may react quickly or even retaliate, which makes male cats choose to avoid conflict with female cats in most cases.
2: In natural cat populations, there is often a relatively harmonious relationship between male and female cats, especially when there is no competitive pressure or territorial disputes.

3: Although the heat cycle may cause male cats to exhibit greater aggression, if the female cat is unwilling to mate, the male cat may choose to give up rather than forcibly attack.
4. If male and female cats live in the same territory and resources are plentiful, they are unlikely to conflict over territory or food. In most cases, male and female cats can maintain a relatively harmonious relationship.