Just because a straight man is attracted to "women" doesn't mean he needs to date all women or even many women to be "satisfied". Being bisexual just means that you are capable of being intimate with either men or women. Many bisexual people are in happy monogamous relationships. A bisexual person is attracted to the individual not their gender. In many ways this makes them the most likely to enter into monogamous relationships.
Bisexual individuals face hostility for precisely the reasons you brought up. People claim it does not qualify as a true "minority" category. Bisexual people are often discriminated against by people within the gay community and straight community for being "on the fence". It is amazing to me that many people can comprehend being gay or straight but cannot seem to wrap their heads around bisexuality.
I don't want to offend anyone (even though I understand I probably will) but can someone please help me understand why being bisexual should have any impact on an application?
You get turned on by/fall in love with more types of people than anyone else right? What does that quality or experience offer a law school in terms of diversity? (Or anything else for that matter)
And as a bisexual, do you have any desire to enter into a monogamous relationship with one person? Or do you require intimacy with both sexes in order to be satisfied? And if so, do you support polygamy? (e.g., one straight man married to two bisexual women)