is a crush sexual attraction??

wait so I'm confused. When people have a crush on someone do they want to get together with them or just like them romantically? I've never had a crush on someone and thought "they're so hot I want to do them". I mean I know when someone's hot and occasionally I'll get aroused by a shirtless scene or something but I've never wanted to fuck someone I've had a crush on?? Is that normal or could this be a sign that I'm asexual