In 7x16, Out With The Old, the first cursed object the brothers investigate is a pair of ballet shoes that caused a dancer to dance her own feet off.
Later, they follow Dean around, tempting him to put them on and suffer the same fate.
Now, early in the episode Dean chokes about having watched Black Swan for obvious reasons (hot tutu on tuto action) but I’ve always found it hard to believe that he would easily catch the Prince’s name in Swan Lake if that were the case. The Prince or the dancer who plays him barely feature in the story at all, so Dean had to pay attention to more than just two women making out.
Plus, the shoes chose Dean.
That might not mean much, since he touched them earlier.
And of course the dancer touched them when she bought them; but the only reason Dean comes into contact with them at all is because a little girl puts them on.
They appear in front of her when she’s alone, but she hasn’t touched them before - she is forbidden to do so.
The only explanation we got for this is her father’s comment “She loves ballet”.
In order words, the curse may not be activated by touch, but by the desire to dance or at least an affection for ballet.
If that were the case, it could be just another one of Dean’s suppressed desire’s - being interested in ballet is not what a manly man is.