She would have to prove the allegation and your defense was explained in your question.
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If your wife was to allege "rape" it would be grounds for her to seek a Restraining Order under the Prevention of Domestic Violence Matter. You would have an opportunity to defend yourself. The facts as you provided them may be helpful in securing such a defense.
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I agree with my colleagues. I would like to add that appears that this occurred in Europe. This obviously has no impact here because NJ would not have jurisdiction over that incident. You may be referring to a fear that it could occur here in which she claims she was raped in NJ. She may need therapy or both of you may need counselling. It sounds very odd. Your number one concern should be protecting yourself.
I agree with my colleagues. But be careful. Just because you can defend the case does not mean you can not be dragged into the system. Do not engage in play that results in marks or bruises at this time. And no means no.