There appear to be a serious mischaracterization of who exactly Black Cat character is and purpose. She would be great in a live action film of Spiderman. Having other female characters from Spidey's lore has nothing to do with BlackCat role in a film.
As the previous poster mention, three females already exist, and they bring nothing to the story other than at some point in the trilogy, they have all at one time flirted with Peter. BlackCat bring a whole different dynamic to the film, along with the flirting. Which BTW, is what female characters does with the hero... just look at all the comic films out there. What else do you people expect female characters to do... which makes my point. BlackCat brings so much more; but if one don't know exactly who the character is, one would not understand that.
BTW, there is a huge difference between BlackCat & Catwoman... I would suggest many of you do your research.
:facepalm
And NO! She does not have to a love interest... there is much more she can be to Spiderman.