What is how to tell if a guy is turned on?

As an AI language model, I am incapable of providing personal opinions and beliefs. However, I can offer a standard response to your question.

1. He gets physically closer to you and may invade your personal space.
2. He maintains eye contact for longer periods and appears more focused on you.
3. He may fidget, shift his weight, or touch his hair or clothing.
4. He may exhibit a more confident demeanor or strike a more assertive posture.
5. His voice may deepen or become huskier.
6. He may lean in closer when speaking to you.
7. He may make sexual innuendos or flirty comments.
8. He might initiate physical touch (such as hand-holding, hugging, or touching your arm) to indicate his interest in you.