Senorita o muchacha?

I've always been curious about the definition of "muchacha." I knew it meant female of one variety or another, but this past week I really wanted to get clarity. Therefore I asked several locals on their take. The responses varied as you can see below.

"Girl," said one man.

"So what's the difference between a muchacha and a senorita?" I asked.

"They're the same," he said.

Another man confirmed the answer of the first man, but he grinned when asked the definition of muchacha.

While in Todos Santos, we asked a young waiter his opinion.

"Well," he said, "a muchaha is not what you say, a virgin. A senorita is a virgin."

This was a good scoop!

When we asked a waitress at Billigan's Island, she hinted that a muchacha might have more than one boyfriend. A waiter at Billigan's island insisted that a senorita and a muchacha are "the same."

Seems you get a different answer depending on who you ask. Therefore I'm not changing my interpretation. I still think a muchacha is not necessarily a slut, but a sexy woman.

Donde esta las muchachas?