Someone who is attracted to both genders, but one or both are non-sexual attractions. They still wish to participate in typical relationship activities; holding hands, snuggling, hugging, going out, buying gifts, etc. However it does not involve sex.
Mom: Are you gay?
Me: NO! I'm strait!
Mom: But i saw you kissing her!
Me: Mom, i'm not bisexual or gay! I'm Biromantic! Vaginas are terrifying!