"Of course, people do go both ways."
From the 1997 book of the same name by Wayne M. Bryant, these are the films he discusses that contain bisexual characters (or possibly/probably bisexual characters). The last eight are in the "maybe/depends on how you look at it" category.
I did not include the movie adaptations that the author claims erased bisexuality that was in the source material, nor the many, many films he lists starring, directed by, or adapted from works by bisexuals (or possible bisexuals).
The book is more of a list than an actual book, honestly.