How many female characters are there in the movie "Spider-Man 3"?
female characters refer to gender = 'Female'; "Spider-Man 3" refers to title = 'Spider-Man 3'
SELECT COUNT(*) FROM movie AS T1 INNER JOIN movie_cast AS T2 ON T1.movie_id = T2.movie_id INNER JOIN gender AS T3 ON T2.gender_id = T3.gender_id WHERE T1.title = 'Spider-Man 3' AND T3.gender = 'Female'