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Sexuality is a spectrum. This means it varies between one side:heterosexual and the other: homosexual. You can't be entirely on one side because there are people that find out they like the same sex later in life.
Attraction could also be towards their personality and not limited to appearance.
Consider it like a spectrum of skin color. Some people are paler than others while others are born more tan. Some are in-between.
I believe bisexuality is exactly in the middle, but obviously leads to one side just a little more.
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Accepting only one opinion is hardly answering a question that calls for opinion. There is no such thing as a bisexual. Bisexuality is immature sexuality. In all my 71 years I have never met a bisexual. One person claimed to be but he was my immediate neighbor and I never saw a woman leaving his apartment in the AM. When we went to Prague together he spent all his time at Pinocchio's - a gay rent-boy bar! And every night he brought home a little something for a midnight snack.