I am also curious to know how a person's likings can swing both sides. But I don't consider it freakish or perverse but having more options. This can be a challenge for a bisexual person who feel more attracted to both genders, and may make it difficult to make a decision for their life partner. But if they are able to deal with it, others shouldn't have a problem. I believe most people are just uncomfortable with sexual energy and tension, and prefer a simplified model of a man and a woman. Most of our systems are created this way. I hope we all learn to focus less on sex and more on the person.