What is an x-ray kink?
X-Ray.
Is when you can See in through someones body while they are having Intercourse.
Like a Man inserting and you can still see his Privates despite him being inside someone.
Or if you still can't get it got to a Hen-Tai site like Nhentai, and search X-Ray.
Stay away from Netorare, X-Ray and NTR go hand-in-hand pretty commonly. This is the only part where looking at Porn is actual research.
Why you should Stay away from NTR, is due to the Conundrum that a Bigger Penis, overpowers True emotional excersion of love.
Also nearly every NTR is depraved.