Am I wearing thongs wrong?

This is hilariously embarrassing, but I recently noticed that in pictures of women wearing thongs the back strap of the thong is clear up their butt crack! 
My whole life, I have always bought thongs one size up so that way the back strap doesn't give me a wedgie and doesn't go between the cheeks. So in a sense the back strap sits on top of my crack-area rather then all up in it! (I hope this is giving you a good laugh by now)  
I truly want to know how majority of women wear them! Is the thing up all in your crack? Or sitting on the outside of your crack? 

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