Rule 63, which dictates that every fictional character has, somewhere, a gender-swapped equivalent. One of the most prevalent examples is in comic books, where every Batman has a Batgirl and every Superman has a Supergirl. However, Spidergirl really exists, so in this case the Rule64 law not applies:)
CosplayErotica loves Spiderman and superheroines, so we created this erotic cosplay set.
