Out and About, with Hookers?

So I'm in San Diego at the Society for Neuroscience annual meeting. Don't bother trying to break into my house while I'm gone either; Mike the cat is still there. I'm staying at the San Diego Bayfront Hilton. It's on the water, right by the yard where Dole (the fruit company) freighters unload truckloads of fruit. There's a plaque by the dock; apparently, 491,000 bananas a day are being delivered every. day. My room overlooks the yard. I am fascinated by this the way a cat is fascinated by running water or a flushing toilet. More interesting than the neuroscience.

I haven't had a single wedge of pineapple since I've been here.

Last night, I'm going up to my room when a girl sitting in the lobby makes eye contact and smiles at me. I give her the I'm-in-a-hurry nod, but she escalates. Now I think she might recognize me, so I slow. I ask her if we know each other. She says no. She asks my name. I ask hers. She asks if I want to hang out.

At this point I am 50/50 between her being someone looking to hang out or being a hooker*. Simply put, I am not, generally speaking, attractive enough to warrant a woman coming on that strong. Unfortunately, it's difficult to ask someone you've just met if they are a prostitute or just lonely. If anyone has a technique for this, I'd like to hear it.

*Full disclosure: I am in the process of reading Sin in the Second City, a book about early 20th century prostitution.