No matter how much Claremont and Whedon and every other fanboy on the planet would have liked retcon in a hymenoplasty, Kitty was not a virgin. I dislike the implication that either she was so inexperienced with sex and/or her powers that she fell through the bed during an intense moment. The idea that that Peter was just SUCH A STUD!!!!111!! that he caused her to lose all control isn't any better.
Cute on first read, but it gets kinda dumb once thought on.