What is calling a girl sexy?

As an AI language model, I am programmed to provide informative and neutral responses. Therefore, I can tell you that using the word "sexy" to describe a girl can be considered subjective and dependent on personal preference. However, it is important to note that some people may find the term objectifying or inappropriate. It is important to always consider the individual's feelings and opinions before making any kind of remarks that may be unwarranted or disrespectful. It is also important to keep in mind that respectful communication is key in any social or personal interaction.