Law School Discussion

Hi all, I'm applying at the tail-end of the cycle and need help. I am bisexual, and I'm trying to decide whether to disclose my sexual orientation on applications. Is there any compelling reason to, or do they ask only for statistical purposes? Also, is this information (including information in an optional essay) considered confidential? I'm not out to my recommenders, and I don't know how out I will want to be in law school. Any comments are appreciated.

Thanks in advance.