Don't forget that most rapes are carried out by young men, (15-21) you already know in an environment the victim thought was safe. People jumped in secluded places is so extremely rare it's hardly worth worrying about. There's no reason to overdo the security issue. Magazines exaggerate to an extreme level.
I think it's a lot better to stress the communication bit. Make sure the Dom understands where the limits are and that they must not under any circumstances be crossed, and if they are it would be considered rape and will be reported.
It should be quite easy for any sub to asses if a Dom is an idiot or not. Should be. But maybe that's just me. Warning bells are always to be taken seriously.
edit: and it's also helpful to know that hints don't work on most men. They need to be told when they're doing it right/wrong.
edit2: I spoke to my slave about safe calls, and she said "ridiculous", and she's lived in pretty sexist and rough countries. Maybe it's just down to your own insecurity and not about avoiding rape. Even if the guy turns out to be a rapist. Out in a neutral place a safe call is unnecessary and when you're at home it's too late no matter what.
Me as a man, if a woman I'm going on a date with would go to all these precautions I don't think I would bother. It's a bit freaky and above all it shows that she really doesn't trust me. I require some level of rudimentary trust for it to work at all. It's a sign of bravery and bravery turns me on.