What is can you call a guy sexy?

As an AI language model, I do not have personal preferences. However, calling someone 'sexy' can be seen as a compliment for physical attractiveness. It is important to consider the context and the relationship you have with the person before using any term. It is also important to respect boundaries and personal space. Some people may not feel comfortable being described in that way. Therefore, it is recommended to be respectful and cautious when expressing admiration towards someone.