Advise her to wave and smile riding by.... but not to stop.

One time at the famous Laughlin (NV) River Run, in the destination casino, a bunch of those guys (in colors) tried to make off with my wife. There was some discussion of them wanting to show her their etchings in their room upstairs.
I told her that the leather bustier she wore that day looked fetching and all (bursting out the top), but it might get her in trouble in that croud.