Whether wearing a diaper is fun is subjective and varies from person to person.
For some individuals, wearing a diaper is primarily a sensory experience. The feel and look of the diaper itself can be pleasing and reinforcing. This might include aspects like the texture of the material, the bulkiness, or the feeling of security it provides.
Others engage in role-playing or age-play, sometimes sexually and sometimes not. In these cases, wearing a diaper can be a part of acting like an infant or a young child, which they find enjoyable. It is important to note that this is a diverse community and motivations for wearing diapers can vary greatly. Some may enjoy the feeling of dependency, while others appreciate the comfort or novelty.
Ultimately, whether someone finds wearing a diaper "fun" depends on their personal preferences and motivations. There's no single answer that applies to everyone.
