Can I send perfume to a boy who has a crush on me? His birthday is coming, and I want him to know that I like him.

Absolutely. Don't be afraid. Although I am a boy, sometimes I have dinner with other female classmates, and they all tell me that they profess their love or give something to the boy. However, be prepared. After all, your feelings for each other are not determined by one sentence. It's good to get what you can, but don't be discouraged if you can't get it.