Implied sex + horny man who can't get a girlfriend on his own and is possibly really old + foreign country = NOT GOOD
Tooooooootal slippery slope argument, and a vague one at that. If you mean that if she refuses to have sex with him he's going to go apeshit and rape her*...come on. If every man who was disappointed that he spent money on a girl and didn't get laid as a result decided to rape or kill her or do unto her whatever heinous thing you mean by "NOT GOOD", there would be precious few females in this world who remain alive and un-raped and un-heinoused.
Maybe you mean that old guy's balls might get so blue that he cuts off her allowance and she can't get home. Okay, I can see how that would be a problem for her. But for fuck's sake,
she's an adult. She makes her own decisions, and she's decided to go on this trip while knowing full well what is implied and expected of her. If she wants to go to some foreign country with no money of her own and then piss off her ride home, that's a direct result of poor choices that
she made, and it's her own stupid problem.
By the way, "horny man who can't get a girlfriend on his own and is possibly really old" is a description that fits
approximately 80%** of all men walking the face of the planet. Myself included.
*"Rapeshit"?
**
Scientific American, Volume XVIII Issue 28, April 2010