What about the fact that there is no Tumah (besides the inherent tumah associated with them) by non jews, which means that a non-jewish woman can not become a Niddah, taking away any possibility of her being an Ervah?
OP, next time you have a question, you are much better off asking a Rabbi for the simple reason that the posters here tend to exaggerate and often type before they think. Speak to someone who knows you and your situation, and don’t worry – next time you meet the CEO of Yahoo!, if she sticks her hand out for you to shake it and you take it, you will not be struck by a bolt of lighnng. Just make sure you give Maaser 🙂