Hotel lobbies are convenient places for lonesome people of either sex to find someone to help them forget their loneliness. But if you are NOT looking for adventure DO NOT talk to strangers in lobbies.
It's wise not to mention your room number to strangers whom you meet in lobbies, and don't answer a knock on your room door unless the visitor has first announced himself on the house phone.
Many a gal has been konked on the head and raped, and many a man has found himself knocked out and his valuables gone because they opened to a tap.
If you hear a disturbance in another room, don't get helpful and join in. Phone the desk, or forget it.
(INSIDE STUFF: Switchboard operators at most hotels have been instructed by the management to listen in on your calls and report pertinent things they hear.
That's how they get wise, even in the biggest hotels, when you have a visitor in your room, often before the visitor arrives.)