Just be ready to back off, and don't come on too strongly. And own up to it too.
Likewise, if you don't like if someone else is flirting, don't be afraid to tell them. If you think you have *reason* to be afraid to tell them, report it to security. But if you tell them and they back away harmlessly, don't make a big deal out of it either.
Both sides are going to be sending out unintentional signals, and things are bound to be misinterpreted on all sides.