These are rules from the dawn of time.
Those who did not follow them often did not come back home.
“When you are in unfriendly territory, do not accept a drink, accept food or go off with a local girl (or boy) for some cuddle time.”
One time in Mexico City, and one time in Rio, my buddies and I were hanging in bars, a really hot girl starts hitting on my friend, and I tell him, “Even in the States, girls this hot never hit on you. Be careful.”
Both times he ended up drugged, passed out and robbed in an abandoned apartment.
Now, he has more ex-wives than I have socks.
Some boys never learn.