So, here is a list of bisexual romantic movies that may reflect the issues of bisexuals a bit better (minus the occasional murder here or there). Some of them are simply fun, some are very serious, some will make you cry. But, they're not the ones you've expected, like "High Art" or "Brokeback Mountain" or "Cabaret" or "Velvet Goldmine."
Some of the movies are available online very easily. Some are on Amazon or Netflix, but a few of the others you'll have to do some searching to find. Inevitably, they're all worth watching. If you have any other ideas, mention them in the comments below.